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Feel better after being outside? There’s a scientific reason for that.

Throwing shade at mental health. But, you know, the nice kind of shade.

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As long as humans have been reading and writing, thinkers and researchers have been studying trees and their immense impact on our world.

We know they're powerful carbon sinks, sucking up carbon emissions and helping purify our air and limiting runaway climate change. We know their extensive root systems act like giant sponges, helping to sop up rainwater during storms and prevent erosion. At all stages of their life cycle, they provide habitats for other living things — from moss to lichen to insects to birds to delightful Disney-esque woodland creatures.

Nature is adorable! GIF from "Bambi."


With all of the things trees do for the world, it's easy to wonder: What other ways do trees influence our lives? When people say they feel better after a long walk in the woods, is there a psychological, or even physiological, reason for that? According to scientists: yes. There really is.

The physical health benefits of trees are hard to deny.

A 2014 study in Environmental Pollution tried to quantify the health benefits of trees in America. Looking at data from 2010, they determined that each mature tree removes 17 metric tons of air pollution, and collectively, trees prevented 670,000 cases of respiratory problems like asthma and 850 human deaths. A 2015 study of residents in a Toronto neighborhood found that people who reported better health lived on streets with more than 10 trees. Researchers were able to equate those improved health perceptions with an income increase of $10,000 or a relative age of seven years younger.

Image via iStock.

Being around trees isn't necessarily the only way to reap their benefits  — sometimes just having the ability to look at them can help.

A famous study of surgical patients recovering in a Pennsylvania hospital in the 1970s found that persons whose rooms overlooked trees recovered faster than those who didn't have that view. Japanese healers advocate for the health benefits of shinrin-yoku, ("forest bathing"), where people take long walks in the woods while inhaling complementary aromatherapy scents. A peer-reviewed study of shinrin-yoku found that it helped people lower levels of stress hormones and decrease their blood pressure, with benefits lasting up to one month.

Image via iStock.

Whatever it is that's going on in our brains at the time, it really seems that just being in the presence of trees can leave us happier and more content.

Maybe they remind us that life grows and goes on and flourishes in the toughest places. Maybe there’s something about leaves, about vibrant colors, about the smell of strong wood, or the way sunshine looks dappled through summer leaves. Psychologists believe there's truth to that idea. They call spending time in nature attention restoration theory, or ART. The theory behind it is that natural environments demand so much less of our attention than cities do and that being in nature allows our brains time to rest.

Image via iStock.

Whatever it is about trees that improves our mental health, it’s powerful and potentially transformative. Even city planners are taking notice.

In the past decade, major cities, including Barcelona, New York, and Vancouver, have made increasing green spaces and their urban canopy a big priority. For Vancouver, this includes planting lots of new trees, legislating protections for older trees, protecting parklands, and encouraging residents to spend time outside.

Chances are, though, that you're not reading this while you're outside. Maybe you can't even get outside right now. In that case, maybe a few minutes spent looking at photographs of particularly lovely trees can give us some of the same calm, fuzzy feelings? Let's try!

Worried about your taxes? This beautiful tree has been around for 250 years — longer than every American dollar in circulation.

This gnarly pinyon pine is estimated to be between 80 and250 years old. Image via Grand Canyon National Park/Flickr.

Feeling alone? Let this beautiful moss-covered oak remind you that living things can thrive together — and then call a friend to tell them you care.

Image via iStock.

Ex got you stressed? This tree has withstood winter storms for decades. Its boughs have adapted to weather them, just as you can and you will.

Image via Anatakti/Flickr.

Hal Borland famously said, "If you would know strength and patience, welcome the company of trees."

He's right, of course. Though we'd also add in "peace of mind" too.

via FIRST

FIRST students compete in a robotics challenge.

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Societies all over the world face an ever-growing list of complex issues that require informed solutions. Whether it’s addressing infectious diseases, the effects of climate change, supply chain issues or resource scarcity, the world has an immediate need for problem-solvers with science, technology, engineering and mathematics (STEM) skills.

Here in the United States, we’re experiencing a shortage of much-needed STEM workers, and forward-thinking organizations are stepping up to tap into America’s youth to fill the void. As the leading youth-serving nonprofit advancing STEM education, FIRST is an important player in this arena, and its mission is to inspire young people aged 4 to 18 to become technology leaders and innovators capable of addressing the world’s pressing needs.

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1991 blooper clip of Robin Williams and Elmo is a wholesome nugget of comedic genius

Robin Williams is still bringing smiles to faces after all these years.

Robin Williams and Elmo (Kevin Clash) bloopers.

The late Robin Williams could make picking out socks funny, so pairing him with the fuzzy red monster Elmo was bound to be pure wholesome gold. Honestly, how the puppeteer, Kevin Clash, didn’t completely break character and bust out laughing is a miracle. In this short outtake clip, you get to see Williams crack a few jokes in his signature style while Elmo tries desperately to keep it together.

Williams has been a household name since what seems like the beginning of time, and before his death in 2014, he would make frequent appearances on "Sesame Street." The late actor played so many roles that if you were ask 10 different people what their favorite was, you’d likely get 10 different answers. But for the kids who spent their childhoods watching PBS, they got to see him being silly with his favorite monsters and a giant yellow canary. At least I think Big Bird is a canary.

When he stopped by "Sesame Street" for the special “Big Bird's Birthday or Let Me Eat Cake” in 1991, he was there to show Elmo all of the wonderful things you could do with a stick. Williams turns the stick into a hockey stick and a baton before losing his composure and walking off camera. The entire time, Elmo looks enthralled … if puppets can look enthralled. He’s definitely paying attention before slumping over at the realization that Williams goofed a line. But the actor comes back to continue the scene before Elmo slinks down inside his box after getting Williams’ name wrong, which causes his human co-star to take his stick and leave.

The little blooper reel is so cute and pure that it makes you feel good for a few minutes. For an additional boost of serotonin, check out this other (perfectly executed) clip about conflict that Williams did with the two-headed monster. He certainly had a way of engaging his audience, so it makes sense that even after all of these years, he's still greatly missed.

Marlon Brando on "The Dick Cavett Show" in 1973.

Marlon Brando made one of the biggest Hollywood comebacks in 1972 after playing the iconic role of Vito Corleone in Francis Ford Coppola’s “The Godfather.” The venerable actor's career had been on a decline for years after a series of flops and increasingly unruly behavior on set.

Brando was a shoo-in for Best Actor at the 1973 Academy Awards, so the actor decided to use the opportunity to make an important point about Native American representation in Hollywood.

Instead of attending the ceremony, he sent Sacheen Littlefeather, a Yaqui and Apache actress and activist, dressed in traditional clothing, to talk about the injustices faced by Native Americans.

She explained that Brando "very regretfully cannot accept this generous award, the reasons for this being … the treatment of American Indians today by the film industry and on television in movie reruns, and also with recent happenings at Wounded Knee."

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Co-sleeping isn't for everyone.

The marital bed is a symbol of the intimacy shared between people who’ve decided to be together 'til death they do part. When couples sleep together it’s an expression of their closeness and how they care for one another when they are most vulnerable.

However, for some couples, the marital bed can be a warzone. Throughout the night couples can endure snoring, sleep apnea, the ongoing battle for sheets or circadian rhythms that never seem to sync. If one person likes to fall asleep with the TV on while the other reads a book, it can be impossible to come to an agreement on a good-night routine.

Last week on TODAY, host Carson Daly reminded viewers that he and his wife Siri, a TODAY Food contributor, had a sleep divorce while she was pregnant with their fourth child.

“I was served my sleep-divorce papers a few years ago,” he explained on TODAY. “It’s the best thing that ever happened to us. We both, admittedly, slept better apart.”

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