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Guy uses a Ziploc bag to show why text is reversed in mirrors and people finally get it

A seemingly simple but surprisingly confusing reality.

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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 a 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 before 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?

Kitten Aww GIF by MOODMANGiphy

(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?

- YouTubewww.youtube.com

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.

That's because he had to flip the book over to see the cover text in the mirror. The baggy 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.

- YouTubewww.youtube.com

For those who do 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:

- YouTubewww.youtube.com

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.

- YouTubewww.youtube.com

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

Isn't science fun?


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Researchers tested a bottle of Fiji Water against a glass of tap water. This is what they found.

Bottled water is filthy.

Image via Canva

A lab technician tests bottles of water

Here are six facts from the video above by The Story of Stuff Project that I'll definitely remember next time I'm tempted to buy bottled water.



- YouTubewww.youtube.com


1. Bottled water is more expensive than tap water (and not just a little).



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A Business Insider column noted that two-thirds of the bottled water sold in the United States is in individual 16.9-ounce bottles, which comes out to roughly $7.50 per gallon. That's about 2,000 times higher than the cost of a gallon of tap water.

And in an article in 20 Something Finance, G.E. Miller investigated the cost of bottled versus tap water for himself. He found that he could fill 4,787 20-ounce bottles with tap water for only $2.10! So if he paid $1 for a bottled water, he'd be paying 2,279 times the cost of tap.

2. Bottled water could potentially be of lower quality than tap water.



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Fiji Water ran an ad campaign that was pretty disparaging about the city of Cleveland. Not a wise move. The city ordered a test of the snooty brand's water and found that Fiji Water contained levels of arsenic that weren't seen in the city's water supply.

How was that possible? Sarah Goodman of the New York Times explains:

" Bottled water manufacturers are not required to disclose as much information as municipal water utilities because of gaps in federal oversight authority. Bottom line: The Food and Drug Administration oversees bottled water, and U.S. EPA is in charge of tap water. FDA lacks the regulatory authority of EPA."

3. The amount of bottled water we buy every week in the U.S. alone could circle the globe five times!



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That sounded like it just had to be impossible, so we looked into it. Here's what our fact-checkers found:

"According to the video, ' People in the U.S. buy more than half a billion bottles of water every week.' National Geographic says for 2011, bottled water sales hit 9.1 billion gallons (roughly 34 billion liters).

A 'typical' water bottle is a half-liter, so that's about 68 billion bottles per year. Divided by 52 weeks would be a little over 1 billion bottles of water sold per week in the U.S. Because that's based on a smaller 'typical' bottle size, it seems reasonable that a half billion bottles a week could be accurate.

The Earth is about 131.5 million feet around, so yep, half a billion bottles of varying sizes strung end-to-end could circle the Earth five times."

4. Paying for bottled water makes us chumps.



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Beverage companies have turned bottled water into a multibillion-dollar industry through a concept known as manufactured demand. Bottled water advertisements used a combination of scare tactics (Tap water bad!) and seduction (From the purest mountain streams EVER!) to reel us in.

Well, we now know their claims about the superior quality of bottled water are mostly bogus. And research shows that anywhere from a quarter to 45% of all bottled water comes from the exact same place as your tap water (which, to reiterate, is so cheap it's almost free).



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5. Bottled water is FILTHY.

It takes oil — lots of it — to make plastic bottles. According to the video, the energy in the amount of oil it takes to make the plastic water bottles sold in the U.S. in one year could fuel a million cars. That's not even counting the oil it takes to ship bottled water around the world.

And once we've guzzled our bottled water, up to 80% of the empty bottles end up in landfills or noxious-gas-producing incinerators. The rest is either recycled or shipped to countries like India where poor people without environmental and labor protections have to deal with it.

On top of all that, the process of manufacturing plastic bottles is polluting public water supplies, which makes it easier for bottled water companies to sell us their expensive product.

6. There are 750 million people around the world who don't have access to clean water.


A child dies every minute from a waterborne disease. And for me, that's the core of what makes bottled water so evil.

The video wraps by comparing buying bottled water to smoking while pregnant. That may sound extreme, but after learning everything I just did about the bottled water industry, I can't disagree.



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If you're properly disgusted, here are a few ways you can help destroy the bottled water industry:

  1. Don't buy bottled water. Get a reusable water bottle. The savings will add up.
  2. Rally your schools, workplaces, and communities to ban bottled water.
  3. Demand that your city, state, and federal governments invest in better water infrastructure.

This article originally appeared 10 years ago.

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If you do this weird thing with your finger, it'll actually make you a better listener

The body is wired in strange ways.

via Canva/Photos

A woman listening intently and some fingers on a desk chair.

Have you ever gone on a date and were afraid you may not be able to pay perfect attention to the person you’re seeing because you’ll be in a noisy restaurant or club? Have you ever been to a networking event and had difficulty hearing people because of loud music or the rattling of plates and glasses? Find it hard to listen to a child tell how they got hurt while playing on a noisy playground?

We all encounter situations where it might be a little difficult to understand the people we are speaking to. However, a new study out of Aix-Marseille University in France shows a way to improve your hearing and listening comprehension in chaotic environments significantly. Strangely enough, it involves your fingers.

How to improve listening in loud places.

In three separate studies, the researchers found that tapping your finger in a medium rhythmic pattern, about two taps a second, can increase your ability to hear and comprehend what people are saying. The medium pace follows what’s known as the “lexical word rate,” or how quickly people speak.

conversation, night out, club, restaurant, scienceHear each other better.via Canva/Photos

“The motor system is known to process temporal information, and moving rhythmically while listening to a melody can improve auditory processing," the scientists wrote in their report. "In three interrelated behavioral experiments, we demonstrate that this effect translates to speech processing. Motor priming improves the efficiency of subsequent naturalistic speech-in-noise processing under specific conditions."

In plain English, the scientists mean that moving to music helps our brains hear better. They also found that it can improve understanding of speech in noisy places.

The scientists thought that music might play a role in improving listening and comprehension. So, they did an experiment where people listened to some songs before their hearing was tested, and that didn’t improve things very much. But they found that people who performed physical tasks, such as dancing or mild exercise, before having their listening checked found some improvement in speech recognition. But the best way was through “rhythmic priming,” meaning getting yourself ready by tapping out some beats.

dinner, date, conversation, quality, talking, listeningMake a better connection when you can actually hear and absorb what someone is saying. via Canva/Photos

"These findings provide evidence for the functional role of the motor system in processing the temporal dynamics of naturalistic speech," the researchers noted.

Why is it important to be a good listener?

Improving listening skills can be a huge advantage, whether looking to make friends, advance your career, or meet the person of your dreams. While great talkers often get all the attention and accolades, people with excellent listening skills are likely to be seen as likable when making a first impression.

group, conversation, crowd, listening, hearing, understandingNo matter how noisy it is, you can make the other person feel heard. via Canva/Photos

Matt Abrahams, a Stanford communications expert and host of the Think Fast, Talk Smart podcast, says that people should stop feeling the pressure to be interesting and instead work to be interested.

“A lot of us put tremendous pressure on ourselves to be interesting,” Abrahams told Inc. “We want to say exciting, valuable, relevant stuff, and it’s the wrong mindset. I think many of us see small talk as a tennis match where the goal is to get the ball over the net and score. I think we should see it more like hacky sack. The goal is to serve it to the person so they can get it and serve it back to you. Success is when you all work together.”

Being a great listener is a superpower that most people overlook. It gives you a distinct advantage over others, whether you’re trying to get a second date or a promotion. Now, we can improve our listening and comprehension in distracting environments by tapping out our favorite song on our index fingers before the big sit-down.

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7 mindblowing medical breakthroughs that could occur in our lifetime

One day soon, you might be able to grow new teeth. Seriously.

Canva Photos

My family has a history of Parkinson's Disease, so I always see the headlines that promise some major scientific breakthrough in regards to the disease based on small, lab-based experiments or trials run on animals. They give us a glimmer of hope but, far too often, these treatments never see the light of day. The road from promising idea to having a real treatment available for patients is extremely long and arduous. Most potential new medications and therapies don't survive.

But... things do sometimes happen! There are massive medical breakthroughs being achieved all the time. Sometimes it's a new discovery, sometimes it's a successful clinical trial, and sometimes it's the fruit of all that labor finally becoming publicly available to people who need it the most. For example, an RSV vaccine just became available in 2023 for the first time. A powerful non-opioid pain killer was approved in 2024. A new drug came out to treat schizophrenia that was completely different than anything that had come before. Progress is being made every single year.

In our lifetime, say the next five to 20 years, we could see unbelievable advancements in treating certain medical conditions. Here are a few pretty amazing potential developments that are on the horizon.

Scientist working in a laboratory setting. Photo by Adam Bezer on Unsplash

1. Growing new teeth

Unlike sharks, humans are known to grow only two sets of teeth, our baby teeth and permanent adult teeth. If one gets knocked out or lost due to decay or infection, you're out of luck!

But researchers say growth buds exist in our gums for a third set, and scientists in Japan have had success in activating them to grow naturally. It could be a major gamechanger that could one day replace dentures and prosthetics. The team has moved onto human trials and has a target date of having a drug ready by 2030.

2. Cancer vaccines

Medical scientists have made amazing strides in cancer research, especially in the field of vaccines.

Did you know that lung cancer is considered to be the most deadly of the bunch? A lung cancer vaccine could be available very soon. If a cancer vaccine sounds odd, think of it this way: Cancer can be treated by chemotherapy and radiation, but there's always a chance of it coming back. People who have survived cancer could theoretically take the vaccine and massively improve their chances of reoccurrence.

A similar vaccine is showing promising results in clinical trials for pancreatic cancer.

3. Better treatment for Alzheimers

Alzheimer's Disease is one of the most destructive and heartbreaking conditions imaginable. It's also extremely difficult to treat, with most currently available therapies and medications focusing on slowing or temporarily relieving certain symptoms.

One new avenue scientists are exploring is a vaccine that could target a protein called tau, which clumps together and tangles up crucial neurofibers that deliver information in the brain. One such medication aims to activate a patient's immune system and produce "a strong antibody response against both pTau and its harmful aggregated form." The drug was recently fast-tracked by the FDA and has shown promising results in human clinical trials.

Another relatively new development is the availability of monoclonal antibody treatment, which helps slow the progression of the disease. Currently, the treatments are not particularly cost-effective but may become moreso in the near future.


smiling woman in gray cardigan Photo by Tatiana Zanon on Unsplash

4. Breakthrough treatment for Huntington's Disease

Huntington's is a fatal central nervous system disorder that shuts down key brain functions in patients like speech, walking, and cognitive function. Some of the symptoms can be treated but, so far, little can be done to slow or stop the progression of the disease.

However, a new drug known as PTC518 was recently fast-tracked by the FDA due to promising results in clinical trials. It attacks mutant Huntington protein in blood cells and in cerebrospinal fluid and has been shown to improve symptoms of the disease in a 12-month trial run. What's especially exciting is that this drug attacks the disease itself rather than just treating symptoms at the surface level.

5. Targeted viruses that kill antibiotic-resistant bacteria

Bacteria is getting smarter and evolving. Antimicrobial resistance is a grave threat to the global population as well-known antibiotics become less effective against infection and new antibiotics are expensive and difficult to develop.

(If you've ever dealt with a staph infection, you know how scary it is when drugs just... don't work.)

This is where special viruses, called bacteriophages or just phages, come into play. These viruses selectively target and kill bacteria, and were actually first used about 100 years ago. Scientist are coming around to using them again. In select settings, they've proven to be incredibly effective against resistant infections, but will need more testing before they become widely available. However, it's definitely possible that this become a viable alternative to antibiotics in some cases in the next few decades!

6. Synthetic and bioprinted organs


human heart Photo by camilo jimenez on Unsplash

There are simply not enough donor organs going around for all the people who need a healthy liver, heart, or kidney.

Luckily, incredible strides have been made in creating artificial organs that can function like the real thing. A man in Australia just lived for 100 days with a titanium heart while he awaited a transplant! And bioprinting technology – quite literally 3D printing using real tissue and living cells — has the potential to create new working organs from scratch in the near future. Genetically modifying animal organs to function in humans temporarily or maybe even permanently has also come an extremely long way and is a process that will drastically improve in the coming years.

7. A one-pill cure for Hepatitis B

Hepatitis B is a potentially fatal infection of the liver that affects hundreds of millions of people worldwide. There is a safe and effective vaccine available to some people, but it's only preventative and won't treat active infections.

A research team in Israel recently discovered that a low dose of well-known chemotherapy drug, Curaxin-137, completely destroyed a crucial and mysterious protein that the Hepatitis virus depends on. The testing was done in a lab setting, so the next step is clinical trials. The team hopes that one day in the not-so-distant future, patients could take a single dose and completely eradicate the virus in their system. That's about as close to a miracle-cure as you can get!

Not all of these potential breakthroughs will come to fruition, but it's pretty amazing to dig into the advancements and discoveries that are being made every day. This list is just scratching the surface, to say nothing of robotic surgeons that will make major surgeries less invasive, new treatments for baldness, nanotechnologies that can deliver medicine to specific parts of the body, and more. Ultimately, good news is coming relatively soon for people who need it.


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