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Dear America: Kids doing active-shooter drills is not normal.

As thousands across the nation prepare to take to the streets on March 24, 2018, for The March for Our Lives, we're taking a look at some of the root causes, long-lasting effects, and approaches to solving the gun violence epidemic in America. We'll have a new installment every day this week.

I was teaching in a high school classroom when the Columbine shooting happened.

In between periods, a student rushed into my room and turned on the television. As other students shuffled in, they caught the scene on TV and stopped in their tracks.

Together we gaped silently at aerial footage of teens pouring out of their school, covered in their classmates' blood. News reporters struggled to offer details about the shooter or shooters, still unclear if the carnage had ended. Still unsure of the body count.

I looked around at my 15- and 16-year-old students, their eyes wide with a mix of shock and fear. Even the goofy class clown stared somberly at the screen. I considered whether it was prudent to let them see all of this, but the only difference between that high school and ours was geography. Those bloodied students could have been my students. They knew it, and I knew it.

It seems commonplace now, but that was a feeling I'd never felt as a teacher before. And I'd only felt something similar once as a kid.

Tom Mauser walks along a wall at the Columbine High School Memorial; his son Daniel was one of students killed in the Columbine shooting. Photo by Don Emmert/Getty Images.

I remember when I was little, sitting huddled in a ball under my desk, imagining the classroom around me exploding.

It was the early 1980s. I must have been 6 or 7. My class was doing a nuclear-blast preparation drill, a hallmark of the Cold War era in which I was born. I remember staring at the thin metal legs of my desk, wondering how they were supposed to protect me from a bomb going off.

Nuclear annihilation — not being gunned down in school — was the big concern of my childhood. Such duck-and-cover drills disappeared by my middle elementary years, so the threat felt short-lived. Of course, a nuclear blast is always a terrifying thought, but somehow, I just knew it wasn't likely to happen.

I imagined it, though. And the imagining alone shook me as a young child. Sometimes I look back and wonder how Americans lived like that for so long.

A kindergartener in Hawaii hides under a desk during a lockdown drill. Photo via Phil Mislinski/Getty Images.

Kids in high school now have been doing active-shooter lockdown drills their entire childhoods.

The year after Columbine, my husband and I started our family, and I left teaching. I chose to homeschool my kids, and though lockdowns weren't part of that decision, the lack of active-shooter drills has been a significant perk of homeschooling.

Unlike nuclear preparation drills, active-shooter drills are meant to prepare kids for something they know has happened multiple times. They've heard the news stories. Some kids have been through the real thing themselves.

I try to imagine it — my sweet 9-year-old boy huddled in a closet with 20 of his classmates, forced into unnatural silence as they wait for the sound of a would-be shooter trying to enter their locked classroom. I can see his face, the very real fear in his eyes. I can honestly feel his racing heartbeat.

It guts me just to think about it.

An elementary school teacher (who requested anonymity because the internet is ridiculous and she's received death threats) posted a description of a recent active-shooter drill in her classroom. The post has been shared close to 200,000 times and for good reason. It's a simple description of an unfathomable reality.

"Today in school we practiced our active shooter lockdown. One of my first graders was scared and I had to hold him. Today is his birthday. He kept whispering 'When will it be over?' into my ear. I kept responding 'Soon' as I rocked him and tried to keep his birthday crown from stabbing me.

I had a mix of 1-5 graders in my classroom because we have a million tests that need to be taken. My fifth grader patted the back of the 2nd grader huddled next to him under a table. A 3rd grade girl cried silently and clutched the hand of her friend. The rest of the kids sat quietly (casket quiet) and stared aimlessly in the dark.

As the 'intruder' tried to break into our room twice, several of them jumped, but remained silently. The 1st grader in my lap began to pant and his heart was beating out of his chest, but he didn't make a peep."



Image via Facebook, used with permission.

Seriously. These are babies we are putting through this. (Well, not literal babies, but still.)

And these drills can be even more terrifying than you might imagine.

At a high school in Anchorage, Alaska, an officer used the sound of real gunfire — blanks shot from a real gun — during active-shooter drills. The idea was that kids would learn what actual gunfire sounds like so they can act quickly when they hear it.

"We don't want to scare them," the principal, Sam Spinella, told CNN affiliate KTVA. "We want this to become as close to reality as possible."

I am dumbfounded. Those two sentences make zero sense together. We're not talking about a police training academy here — we're talking about an average day in high school. The reality they are trying to prepare them for is scary — how could a preparation "as close to reality as possible" not be?

A recent article in The Atlantic examined the psychological effects of active-shooter drills on kids. Surprisingly, not a lot of research has been done on the subject. All we really have are reports of young adults who grew up with them.

One interviewee described a memory of his classmate coughing during a lockdown drill when he was 12. Their teacher reacted by telling the class that in a real shooter situation, they'd all be dead now.

Yeah, probably not the best way to handle that.

But what is the best way to prepare children for the possibility of a gunman trying to kill their classmates, their favorite teacher, their best friend?

We want kids to feel safe and secure. We don't want to scare kids as we prepare them for something that is undeniably scary. But is it smart to scare them a little bit in order for them to understand the seriousness of the drill? And if kids aren't scared at all — if they are totally unfazed by active-shooter drills — how can we justify them being so desensitized?

Ugh. This is not normal. This should never feel normal.

And yet, this is normal. In fact, some people tell me they feel comforted by the preparation.

I talked to a handful of teens and young adults who grew up with lockdown drills. One described a series of bomb threats at her high school, which she said were scary at first, but eventually became a "boy who cried wolf" situation. Another described intruder drills as simply preparing for the unexpected, not much different than an earthquake or tornado drill.

One high schooler, Joe Burke of Bethlehem, Pennsylvania, told me about the first lockdown drill he remembers in the fifth grade. He and his classmates huddled under computer desks along the wall, knees hugged to their chests, with the lights off and door locked:

"When we were sitting under the desks, I had a slight bit of doubt in the idea. To my fifth-grade self, it didn't seem like the best idea to just be hiding if someone were to come in and try and hurt us. It would only take a few seconds of searching to find 25-plus kids and a teacher all cramped under those tables. ... At the time, I automatically assumed that the adults knew more than we did. I figured that we were much safer than I realize we actually were, in retrospect."

Burke said the new ALICE training his high school has implemented has made him feel better prepared and is "a massive step in the right direction." (ALICE is a for-profit training program that has been implemented in schools across the country. Here's an interesting analysis of the praise and criticism of it.)

Joe Burke spoke at his high school's walkout on March 14, 2018. Photo via Christine Burke, used with permission.

Joe's mother, Christine Burke, said that she has made it a point to talk to her kids about active shooter situations in detail:

"After Parkland, I sat with my 15-year-old son and showed him the footage of the shooting inside the building. We talked about how the smoke from an AR-15 would disorient his way out, that the gun would be loud, that screaming classmates would make it hard to hear instructions. We talked about how his phone need not be a priority (no filming the scene, no taking pictures) but that he should use it as a means of communication only if he could. And we talked about how the ALICE training would feel in a real situation. That conversation with my son chilled me to my bones because I realized that this is the world we live in now. I have to talk to my son about his algebra grade and about how loud an AR-15 sounds when fired in a classroom."

Christine, like many parents, finds herself navigating surreal waters. We have accepted the inevitability of school shootings to the point where we actively prepare our kids for them.

Generally speaking, preparedness is good. Preparedness is smart.

And yet, how can we accept that this is the reality for children in America? Parents across the country constantly say to themselves, "We shouldn't have to do this. Our kids shouldn't have to do this." And yet, they do.

Christine Burke (left) and her friend Jen were the only two parents who joined her son's school walkout for National School Walkout on March 14, 2018. Photo via Christine Burke, used with permission.

Is this really the price we have to pay for freedom?

We're supposed to be a fantastic, developed country, aren't we? We pride ourselves on being a "shining city on a hill" a leader among nations, a beacon of freedom to all people.

There is no official war happening on American soil. We are not a country experiencing armed conflict or revolution or insurrection. And yet we live as if we are.

People in other countries look at our mass shootings and what we've attempted to do about them and think we are out of our ever-loving minds. I'm right there with them. As a former teacher and current homeschool parent, I feel like I'm peering in from the outside with my jaw to the floor at what we've accepted as normal for our children.

I'm a fan of the U.S. Constitution and don't take changes to it lightly, but maybe it's time to accept that the Second Amendment has not actually protected our freedoms the way it was designed to. We are not a free people when our children have to hide in closets and listen for gunfire as they imagine themselves the next victims of a mass-murdering gunman during math class.

This is not normal. This should never feel normal.

Kids who have repeatedly and systematically prepared for carnage in their classrooms are taking to the streets, to the podium, to the media — and soon to the polls — in a way we haven't seen in decades.

It's easy to see why. These teens have spent their childhoods watching the adults in charge respond to the mass murder of children by simply preparing for more of it. And they're done.

I'm unbelievably proud of the way these young people are organizing, saying #NeverAgain and pushing for effective gun legislation. Their efforts have convinced the governor of Florida to break with the National Rifle Association and sign a sweeping gun control bill. (Though not perfect, it's a big step for the "Gunshine State.") Companies feeling the pressure and momentum have broken ties with the NRA as well.

I can't help but note how these kids' successes highlight previous generations' failure on this issue. The time for taking real action was long before Parkland, Sandy Hook, or even Columbine. But I feel the sea change coming.

These young activists give me hope that maybe future generations will look back in wonder at how we lived like this for so long.

For more of our look at America's gun violence epidemic, check out other stories in this series:

And see our coverage of to-the-heart speeches and outstanding protest signs from the March for Our Lives on March 24, 2018.

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Gen Z is the first generation less cognitively capable than their parents but Denmark has a solution

"Since the late 1800s, every generation has outperformed their parents."

Gen Z; Millennials; technology; cell phones; social media; teens and technology; teens social media
Photo credit: Canva

Gen Z is the first generation less cognitively capable than their parents. Denmark has the solution.

Nearly every parent hopes their child will be better off than they are: smarter, more secure, and more well-adjusted. Many parents see this as a stamp of successful parenting, but something has changed for children growing up today. While younger generations are known for their empathy, their cognitive capabilities seem to be lagging behind those of previous generations for the first time in history.

Dr. Jared Cooney Horvath, a teacher turned cognitive neuroscientist who focuses on human learning, appeared before Congress to discuss concerns about cognitive development in children. In his address to the members of Congress, he says, "A sad fact that our generation has to face is this: our kids are less cognitively capable than we were at their age. Since we've been standardizing and measuring cognitive development since the late 1800s, every generation has outperformed their parents, and that's exactly what we want. We want sharper kids."

kids, intelligence, sharp kids, generations, education, cognitive abilities Student smiling in a classroom, working on a laptop.Photo credit: Canva

Horvath explains that the reason this happens is that each generation has gone to school longer than the previous generation. Gen Z is no exception to the longer duration of time spent in school, but they're the first ones who aren't meeting this normal increase in cognitive development. According to the cognitive neuroscientist, the decline is due to the introduction of screens in the classroom, which started around 2010.

"Across 80 countries, as Jean was just saying, if you look at the data, once countries adopt digital technology widely in schools, performance goes down significantly. To the point where kids who use computers about five hours per day in school for learning purposes will score over two-thirds of a standard deviation less than kids who rarely or never touch tech at school," Horvath reveals.

In most cases, the decline in performance doesn't result in better strategies. The neuroscientist shares that the standardized testing has been adjusted to accommodate lower expectations and shorter attention spans. This is an approach that educators, scientists, and researchers went to Capitol Hill to express wasn't working. But not every country is taking the approach of lowering standards to meet lowered cognitive ability. Denmark went in the opposite direction when it realized their students were slipping behind.

France24 recently interviewed educators in Denmark following their seemingly novel approach to students struggling with cognitive development. Since the beginning of the 2025/2026 school year, Denmark has not only been having students turn in their cellphones, but they've also taken tablets, laptops, and computers out of the classroom. No more digital learning for the majority of the school day. Danes went old school by bringing back physical textbooks, workbooks, and writing assignments. The results have been undeniable. Even the students can't seem to deny the success of the countrywide shift in educational approach.

"I think the biggest issue has been that, because we kind of got rid of the books and started using screens instead, that we've noticed that a lot of the kids have trouble concentrating, so it's pretty easy to swipe with three fingers over to a different screen and have a video game going, for example, in class," Copenhagen English teacher, Islam Dijab tells France24.

Now, instead of computers being part of every lesson, Denmark uses computers very sparingly and with strict supervision. One student says that it has been nice not having screen time at school because she loves to read and write. But it wasn't just the lack of attention span children were developing, they were also developing low self-esteem and poor mental health due to the amount of time spent on devices.

kids, intelligence, sharp kids, generations, education, cognitive abilities Students focused and ready to learn in the classroom.Photo credit: Canva

The data showing the negative impact of screens on teens' brains has prompted a nationwide change in Denmark that extends outside of the classroom. Afterschool activities are eliminating or extremely limiting electronic use. There is also a national No Phone Day that encourages everyone to put away their devices for the day, and Imran Rashid, a physician and digital health expert, is petitioning parliament to ban social media use for children under the age of 15. The no phone movement in Denmark is a nationwide effort that hopes to right the ship before another generation feels the effects.

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Inside a Dutch 'dementia village,' where the whole neighborhood is designed for memory loss

The Hogeweyk provides a sense of "normalcy" for people living with dementia.

dementia, dementia village, elder care, memory care, alzheimer's disease

In a dementia village, people get to choose where they go.

No matter how much caregivers may want to keep a loved one with dementia in their home, it's not always feasible. Living with dementia is not easy, nor is living with someone who has dementia. But moving a loved one with dementia into a traditional care facility isn't always ideal, either. It can be difficult to find a suitable living situation that ticks all the boxes for what a family and their loved one would want.

That's where a "dementia village" comes in as an alternative. Instead of trying to fit a person with dementia into a living situation that either isn't designed for them or is overly focused on their limitations, a dementia village is an environment designed specifically to help people with severe dementia feel safe and free and live as normal a life as possible.

- YouTube www.youtube.com

The Hogeweyk was the world's first dementia village, founded in 2009. Since then, the idea has been replicated in dozens of locations all over the world. The concept is quite simple: A full, self-contained neighborhood where people with dementia can walk around freely without fear of getting lost, where everyone from shopkeepers to restaurant servers to salon workers are trained in dementia care, and where people who are losing their memory to dementia diseases are treated as people who still have aspirations.

Eloy van Hal, one of the founders of the Hogeweyk, explained to Vox how the guiding principle of the village is "normalcy." Traditional nursing homes keep all residents under one roof, and they are subject to do whatever program the institution provides for them. In the Hogeweyk, people live in small groups of six or seven in apartments with furnishings like they'd have at home. Distinct landmarks in the public space help residents know where they are, and putting a theater, grocery store, barber shop, etc. in separate buildings encourage movement through the neighborhood.

"It's about choice, choice, choice, where you want to be during the whole day and with whom," said van Hal. The idea is to balance safe design with controlled risk, allowing for as much of a normal life as possible.

dementia, dementia village, elder care, memory care, alzheimer's disease Every worker in a dementia village is trained in dementia care.Photo credit: Canva

The one downside to the village concept, of course, is cost. Without adequate funding assistance from governments, living in a dementia village can be prohibitively expensive.

Does it really make a difference for residents, though? Has it been proven that outcomes are better than traditional care models? With dozens of villages now being used around the world, research is ongoing, but the data from the Hogeweyk is promising. People in the comments of Vox's by Design video shared how such facilities have been life-changing for their loved ones and how traditional care doesn't always meet the needs of people with dementia.

"My grandmother had dementia and when her caretaker who was my grandfather (her husband) passed unexpectedly we had to scramble to get her into a memory care facility in the US. The first place she was in temporarily was so sad, I could see her spirit drain but after about a year we were able to get her into a "village" and the quality of life difference is nothing short of ASTOUNDING! She could function in a way that was familiar and comfortable to her and not be in a foreign hospital setting. The abrupt change from a home where they are familiar, to a clinical setting must be very disorienting and upsetting to these people. That side of my family had mental health issues and memory loss starts early, so I know it will happen to me to some extent and I only hope I can have people take care of me as well as in this Hogeweyk."

"I've worked in a nursing home through high school and college. While I can't say it was the worst place for dementia patients, it certainly did not work well for all of them. One patient once tried to wedge herself through the door begging to go outside with me and I even had patients confide in me that they hated being institutionalized, they missed being able to live a normal life, being part of a real community, and being able to come and go as they pleased. This concept is probably the closest thing possible to a normal life a dementia patient could ever have."

dementia, dementia village, elder care, memory care, alzheimer's disease In a dementia village, residents can live somewhat "normal" lives.Photo credit: Canva

"A relative of mine used to get aggressive, violent and angry when she would encounter a locked door in the institution she was in. She couldn't understand why there would be a locked room in what she understood to be 'her home', this would take a lot of calming down and management, only for her to discover another locked door, and kick off again. I love these village based models as they allow autonomy for residents, and have an individual experience. Just because someone has a brain disease doesn't mean they aren't entitled to the very best care. I hope the govt spends far more on these establishments in the future."

"As he said at the end, people with dementia are still people—even if there is proven to be no benefits to this model over a care home, I would much prefer to have dignity in my final days than live in a clinical trap. Love all the incredible ideas the Netherlands come up with."

dementia, dementia village, elder care, memory care, alzheimer's disease A dementia village is a self-contained neighborhood with shops and places for people to go like a normal neighborhood. Photo credit: Canva

Dementia care is something Americans are going to have to look at closely. According to The Alzheimer's Association, the number of people living with Alzheimer's is set to nearly double from seven million to 13 million by the year 2050. As more of our elders require full-time care, the more we'll have to consider prioritizing putting resources into things like dementia villages.

Everyone deserves safety and a good quality of life. The Hogeweyk is a great example of what it looks like to view people with dementia as people first and to care for them accordingly.

This article originally appeared last year. It has been updated.

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Want your home to be 'the house' for your teens? Mom shares her 4 tips to make it happen.

Don't mistake being "the house" with being the "cool house."

parenting, teens, raising teens, teen hangout, high school, game night for teens, activities for teens, parenthood
hi.im.amywhite/Instagram

Amy White explains how her house became "the house" for her teens.

I grew up in "the house." In high school, my home was the designated place where my friends gathered, sometimes in big groups, sometimes just my small core squad. My three best friends spent the night there almost every Friday and/or Saturday night for four years straight. We devoured Totino's frozen pizzas by the dozen, inhaled soda, and laid waste to any snacks or leftovers that were brave enough to survive in the kitchen. Not only that, but my house was pretty small — four teenage boys took up a lot of space in the living room (the whole thing) and made a lot of noise playing video games deep into the night. It must have driven my parents and older brothers crazy. It's a wonder anyone put up with it.

Or so I thought when I was younger. When I became a parent myself, I started to understand a little more why my mom and dad were so willing to host and feed all my friends and me every single weekend. Why the outrageous grocery bill and constant chaos in the house were probably a small price to pay.

Mom explains how to make your house 'the house' where teenagers hang

One mom has perfectly encapsulated the value of turning your home into "the house" for your kids and their friends, and exactly how she did it for her family.

teens, teen house, teens hanging out, teens having fun, teenagers Teens hanging out in a living room.via Canva/Photos

Amy White shared a reel on Instagram showing her college-aged son hanging in her dining room with a group of friends playing cards. The text overlay reads "What makes your kids' high school friends want to come over, play cards & spend the night on their College Christmas Break." I think most parents can agree that we want our kids to keep coming home as long as possible! So how exactly did White pull this off?

Her explanation in the caption was spot-on.

First, White says that you have to start early. Become "the hang out house" in high school or even earlier. Then you have a better chance of holding onto the mantle into your kid's college years.


Next, be ready to stock the house with snacks and drinks, and don't make a fuss when your kid's friends have at it. "The kids knew we had food," she writes, "BUT they also knew I didn't care what they had. They knew they could eat anything in my pantry and fridge."

Third, and this is a big one, don't mistake being the "cool house" for being "the house." Some parents choose to allow their underage kids and friends to drink alcohol under their supervision, but you don't have to bend your morals and the law to lure the squad over to your place. Pizza and Coke is plenty to keep most teens happy. "We were not the house that served alcohol or even allowed the kids to bring alcohol to our house. And Guess What?? The kids still came and wanted to hang at our house!"

teens, teen house, teens hanging out, teens having fun, teenagers Teenagers eating pizza.via Canva/Photos

Fourth, always say Yes (as often as possible, anyway) when your kids want to have friends over. "They know my answer is 99% of the time YES," White writes. "You have to have your kids take the leadership of offering your home and if your home was 'open' to their friends in high school, they know it will be 'open' to their friends in college."

As a bonus tip, White pleas with parents not to worry about the mess having friends over makes. "I love a clean house and organization, BUT I would much rather have a crazy messy house for the kids where memories are made than a quiet house with nothing going on just to keep my house 'clean.'"

Should parents allow teens to drink at home?

There's an age-old debate over whether parents should allow teens to drink at home because it's better than if they do is unsupervised or keep their home dry as a bone. A recent study out of the University of Buffalo found that kids who grew up drinking at home had a greater chance of having addiction problems when they got older. "A robust relationship was found between parental permission to use alcohol during adolescence and increased alcohol use frequency and quantity, alcohol use disorder symptoms, and alcohol-related harms in young adulthood," the study says.

White writes, "It's worth being 'the house', so let go of control & get to know your kids friends." Commenters agreed.

White's video went viral to the tune of 8.5 million views and hundreds of comments. Parents shared their own experiences of what it's like being the default hang out house.

"Our house was the high school hangout for my son and friends... every weekend... I loved it!! Miss it now that they are all college graduates and have moved away. I love seeing them when they do come home for the holidays"

"A wise man once said don't be the house with the alcohol. Be the house with the food."

"Amy 1000% agree!!! My house is full of teenagers on the weekends and I love every bit of it. Even though I wake up to a kitchen that looked much different from when I left it"


teens, teen house, teens hanging out, teens having fun, teenagers Teenagers eating pizza.via Canva/Photos

"We never allowed alcohol, drugs, bad language, always respectful, and guess what, our house was always the house where the kids hung out. First my daughter, then my son. Through grade school, high school, then when my kids went out of state for college their college friends would come spend a couple weeks during the summer. I always thought of it this way, I loved knowing my kids friends and, who knows, maybe some of those kids, especially during the younger years, just maybe those kids just needed an adult to care. Anyway, it was always fun to have them here!"

"It used to crack me up when my daughter would bring over a bunch of her friends (girls and boys) in high school and instead of hanging out in the family room they all wanted to crowd into either the kitchen with me or our tiny office and happily share all the gossip with me."

Experts say that knowing your kids' friends, and their parents, can have huge benefits. Not only will it bring you the peace of mind of knowing where your kid is and who they're with when they get to those crucial high school years, it has been shown to tangibly improve kids ability to create positive relationships and problem-solve collaboratively. Plus, it can actually be really fun! Kids and teens are the funniest, silliest, most interesting people on the planet. Having a house full of them is messy and loud, but it's always a good time.

One caveat: "don’t feel bad if your house isn’t the chosen house," one commenter reminds us. "Just be happy your kid has a good group of friends and be thankful they have somewhere safe to hang out."

This article originally appeared last year.

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Guy uses a Ziploc bag to show why some things look backwards in mirrors while others don't

We get it now!

text in mirrors reversed, text backward in mirrors, how mirrors work, mirrors, science
Canva Photos.

Why is text reversed in mirrors?

Have you ever wondered why text shows up backwards in a mirror? It's confusing to our brains because it doesn't seem like anything else is flipped like that. If we turn our head, it doesn't move the opposite direction in the mirror. Or does it? After all, right-handed you is actually left-handed you in the mirror. Right? (Wait, is that right?)

Mirrors can be confusing despite not being very complicated. A mirror image is simply a reflection of what's in front of it. But when someone else is looking at us head on, they don't see text in reverse, so why don't we see what other people see when we see ourselves in a mirror?

mirrors, mirror, how mirrors work, mirror image, text in mirrors Woman smiling in a mirror.Canva Photos.

(If you think this is a super stupid question with a super obvious answer, congratulations. Pat yourself on the back and scootch along so the folks who don't fully grasp the physics of mirrors can enjoy a demonstration that makes it a little easier to understand.)

"Why do mirrors reverse text?" asks the creator behind @humanteneleven on YouTube. "You might think it's just a property of mirrors—they flip things from left to right—but that's not true." He then picks up a metal arrow to show that it points the same direction in the mirror as it does in real life. So why is the text flipped when the arrow isn't?

- YouTube youtu.be

He then holds up a book to show how the text on the book cover appears backwards, just like the shirt. But when he holds up a Ziploc bag with the word "HELLO" written on it, the word shows up properly.

Why? How?

It's because he had to flip the book over to see the cover text in the mirror. The baggy, on the other hand, he could just hold up and see the letters through the transparent plastic, just as we see them in real life. If he flips the baggy over like he did the book, the text shows up backwards in the mirror, just like it does in real life.

"So it's actually not the mirror that's flipping anything from left to right," he says. "It's the human."

People appreciated the simple, straightforward explanation and demonstrations.

"One of the most insightful demonstrations I've seen. It's simple and explains the phenomenon. Well done!"

"While I've heard this explanation many times before, I've only recently seen it demonstrated with text-on-transparency, which is what really makes it click. Great video!"

"Love these sorts of demonstrations. It’s a bit of a complicated one, but I love seeing how different people's minds work when explaining simple things like this. My kid explains it with “left is on the left, right is on the right, things aren’t flipped, they are mirrored” but it’s true that you are the one who flips things and I’ve never thought of it that way before."

"Oh my God, I haven't understood explanations from physics videos about why mirrors flip but this, gosh this helps."

Mirrors have been hilariously befuddling people in other videos as they try to figure out how the mirror "knows" what's behind a barrier placed in front of objects.

@sarahcoome

this is kinda creepy 👀 #mirror #relatable #creepy

Is this something all of us should probably have learned in high school? Yes. Do all of us remember everything we learned in high school? No. Does the scientific explanation make perfect sense to everyone even if it's explained in detail? Um, no.

Like the reversed text question, having a simplified explanation that doesn't fully get into the nitty gritty physics and geometry of how mirrors work is helpful for some folks.

- YouTube youtu.be

For those who want a bit more scientific substance to their explanations, this next video does a good job of giving a bit more detail while still keeping the explanation simple. It even uses a visual diagram to explain:

- YouTube youtu.be

And for those who say, "This is so basic! How do people not understand this?" here's a video that really does get into the nitty gritty physics and geometry of how mirrors work, diving into ray and wave optics, photons, wave functions, probability, and quantum mechanics. It's only 12 minutes, and it manages to entertain while explaining, but it certainly blows the notion that understanding mirrors is super simple.

- YouTube youtu.be

As one commenter wrote, "I thought I understood mirrors. I understand mirrors even less now. And that's a compliment."

Isn't science fun?

This article originally appeared last year.

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8th grader's award-winning experiment finally reveals if a dog's mouth is cleaner than a human's

You've heard the myth. Now read the science.

dog experiments, dog tongue cleaner than humans, experiments by kids, cool science, dogs, fun science, experiments, science
Photo credit: Canva

A young teen boy holding a beagle.

Dogs come in a wide variety of breeds, along with their own unique personalities and needs. They can be guardians, helpful workers, loyal friends, snuggly companions, but there's one thing almost all dogs have in common: Licking.

Sure, some dogs lick way more than others, but it's rare to find a dog who never licks anyone or anything. Many dogs communicate and show affection by licking, which is sweet—if a little gross—depending on how slobbery they are. There's a common saying that dogs' mouths are cleaner than humans', which is a bit hard to believe when you see what some dogs put in their mouths, but it is true?

What does science say about dog tongues and saliva? Is a dog licking our face something we should worry about?


dog experiments, dog tongue cleaner than humans, experiments by kids, cool science, dogs, fun science, experiments, science A man being licked by a golden retreiver. Photo credit: Canva

It turns out, the answer to whether a dog's mouth is cleaner than ours isn't super straightforward.

An 8th grader named Abby tackled this question in a science experiment that won her a Young Naturalists Award from the American Museum of Natural History in 2011. Her family had gotten a dog and her mom kept telling her not to let the dog lick her face because dog mouths are full of bacteria. Instead of arguing, Abby decided to find out herself if this was true.

"I hypothesized that human tongues would be cleaner than dog tongues," she wrote. "I thought this because humans brush their teeth at least once a day. I hypothesized that dogs' tongues would be dirty because they were always licking dirty things like garbage."

After diving into the research about bacteria that live in and on humans and dogs, Abby decided she had a testable hypothesis. But this wasn't any old middle school science experiment. She applied for and got a grant to the State Hygienic Lab at the University of Iowa, where she was assigned a mentor to work with her.

You can read the nitty-gritty details of her experiment here, but it involved a lab, swabs, agar plates, and more. Here was the conclusion:

dog experiments, dog tongue cleaner than humans, experiments by kids, cool science, dogs, fun science, experiments, science A dog's tongue close-up. Photo credit: Canva

"I concluded that dog and human mouth flora are very different. (Flora means the bacteria found in a mouth or anywhere else.) The bacteria found in human mouths are more similar to another human's oral bacteria than the bacteria found in a dog's mouth.

"I also concluded that dogs' mouths are cleaner than humans' in some ways, and dirtier in other ways. Humans have more bacteria in their mouths than dogs do, based on the total number of bacteria. Most of the humans had a 'moderate' number of bacteria, and most of the dogs had 'few' bacteria. A possible explanation of this might be that dogs pant a lot, and maybe while panting, bacteria falls off their tongues along with their saliva. But dogs had more types of bacteria. The average number of different bacterial colonies in a dog's mouth was about 5.7. The average number of different bacterial colonies in a human's mouth was about 4.1. I think this is so because dogs sniff and lick a variety of things, like carpets, floors, chairs, grass, etc., so they pick up bacteria from many places."

But what about the licking of our faces? That's a bit of a subjective call, but Abby's results gave her some peace of mind:

"In conclusion, will I let my dog continue to lick me? The answer to the question is yes!" she wrote. "I will feel guiltless about letting my dog lick me because I found out that human and dog oral bacteria are different, so my dog's oral bacteria present no harm to me."

What do the experts say?

According to Colin Harvey, professor at the University of Pennsylvania’s School of Veterinary Medicine and executive secretary at the American Veterinary Dental College, comparing dogs' mouths to humans' mouth is "like comparing apples to oranges." As Abby found, the microbes in a dog's mouth are very different than those in a human's.

The American Kennel Club elaborates:

"Most of the bacteria in your dog’s mouth aren’t zoonotic, which means you probably won’t get a disease from a big old doggy kiss. There are exceptions to this. Dogs that eat a raw diet are at an increased risk of contracting salmonella, which can be spread to humans. You also probably shouldn’t share kisses with a dog that regularly raids the litter box.

In other words, kissing your dog is less risky than kissing another human, but that doesn’t mean that your dog’s mouth is necessarily cleaner than a human’s—they just have a mostly incompatible set of germs."

Keeping your dog's mouth healthy through regular teeth cleaning and dental check-ups can also help prevent issues that could potentially come from dog licks.

dog experiments, dog tongue cleaner than humans, experiments by kids, cool science, dogs, fun science, experiments, science A golden retreiver getting their teeth brushed. Photo credit: Canva

So there you have it. If your dog doesn't eat a raw diet and doesn't go snacking in the cat box (or some other equally fecal-bacteria-ridden place), their kisses are probably not going to hurt you. Guilt-free pooch smooches for the win!

This article originally appeared last year.

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