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Why Are There As Many Males As Females?

Adults Animals Biology Nature Science

In almost every animal species on Earth, equal numbers of males and females are conceived. Why is that?

What it Feels Like to Slide Downhill at 90 M.P.H.

Adults Human Sports Health

John Daly is an American skeleton racer and a two-time Olympic athlete. Sliding face-down, head-first on a slick bobsled track at 90 mph might sound insane, but for Daly, it's the thrill that keeps him coming back.

Havana - Pentatonix

Adults Art Music Entertainment

Pentatonix is an American a cappella group from Arlington, Texas, consisting of vocalists Scott Hoying, Mitch Grassi, Kirstin Maldonado, Kevin Olusola and Matt Sallee.

What Is The Most Dangerous Sport In The World?

Adults Health Sports

With the Olympics wrapping up, we wondered: what is the most dangerous sport?!

What Is Light?

Adults Science Travel Philosophy

We are so used to some things that we stopped wondering about them. Like light. What is light? Some kind of wavy thing, right? Kind of.

10 Strangest Mysteries That Remain Unsolved

Adults History World Culture Entertainment

What do you think happened?

Debunking Anti-Vaxxers

Adults Biology Health Society

Here's what to say to anti-vaxxers!

We Asked Bill Gates: Do You Need To Be Rich To Be Healthy?

Adults Economy Health Society

This video is in collaboration with Bill and Melinda Gates. You can check out the Gates Annual Letter here: http://b-gat.es/2Cfph0j

The coin flip conundrum - Po-Shen Loh

Adults History Math Problem-Solving

When you flip a coin to make a decision, there's an equal chance of getting heads and tails.

NEW Gravitational Wave Discovery!

Adults Science Space

Scientists have JUST published this new observation.

Are You Smarter Than Average?

Adults Human Society Education Mental Health

Put your intelligence to the test!

How Evolution works

Adults Biology Genetics History Science Evolution

The theory of evolution explains how the enormous variety of life could come into existence. How it is possible for primitive life forms to spawn the millions of different creatures, that exist today.

The rise and fall of the Inca empire

Adults History Society Culture

It was the western hemisphere's largest empire ever, with a population of nearly 10 million subjects.

Why Electroshock Therapy Is Back

Adults Health Mental Health Technology Science

Shocking the brain has come and gone as a medical treatment, but it's currently resurging, as it often provides the best form of relief for severe depression and advanced Parkinson's disease.

Hey Buddy, Can You Give Me a Hand?

Adults Future Machine Learning Technology

Are We Doomed? Boston Dynamics' Unsettling Robot Dog SpotMini Can Now Open The Door

Why Are Mosquitoes Attracted To Me?!

Adults Animals Genetics Nature Science Biology

Mosquitoes are attracted to me and it's likely due to my genes.

Why Our Favorite Crops Live Fast and Die Young

Adults Ecology Industry Science Biology Nutrition

We mostly grow annual plants because they reliably produce energy-rich seeds, which we like to eat.

What If Your Airplane Door Burst Open Mid-Flight?

Adults Science Transportation Travel Adventure

Flying may be more horrifying than you think.

How did teeth evolve? - Peter S. Ungar

Adults Biology Health Human Science Evolution

You may take them for granted, but your teeth are a marvel. They break up all your food over the course of your life, while being strong enough to withstand breakage themselves. How do they do it?

Why Alien Life Would be our Doom - The Great Filter

Adults Science Space Travel Future

Finding alien life on a distant planet would be amazing news - or would it? If we are not the only intelligent life in the universe, this probably means our days are numbered and doom is certain.

Rooftop POV Escape from Hong Kong security!

Adults Cities Internet Culture Sports Adventure

These Daredevils Run From Security And Leap Across Rooftops In Hong Kong