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.

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."

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Hey ladies, you know that uncomfortable moment when you're at a bar with your girlfriends and some sketchy dude comes over to hit on one of you?

Maybe this dude elbows his way into your conversation or maybe he leans too close and tries to buy a round of drinks. Then maybe he not-so-subtly drapes a sweaty hand on one of your shoulders? Yeah, it sucks.

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U.S. doctors first noticed the disease that would come to be known as HIV/AIDS in the early 1980s.

The story starts with a group of doctors, who noticed an outbreak of a rare skin cancer called Kaposi sarcoma in young gay men in New York, San Francisco, and Los Angeles. We now know that Kaposi sarcoma is linked to HIV/AIDS, but at the time, those doctors didn't know what was causing the rare form cancer.

CDC researchers, suspecting that whatever was causing this disease was sexually transmitted, started asking patients to name their partners. And, through this work, the researchers started to build out a map of cases.

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