In honor of October 13th, International Skeptics Day, Hank has put together this playlist of some of the most interesting science-y, skeptic-y videos from all around YouTube.

Since it launched in 1990, the Hubble Space Telescope has snapped more than a million images and changed the way we see the universe, literally.

It takes a lot of fuel to heat our homes, preserve our food, and power our gadgets. And for 40 percent of the world, cheap, plentiful coal gets the job done. But coal also releases pollutants into the air, causing environmental damage...

SciShow explains the genetics -- and physics -- behind why blue eyes are blue, and what the future may be for the trait. Spoiler alert: Blue eyes aren't really blue! SciShow explains!

A brief intro to the current theory of (almost) everything - the Standard Model of particle physics. It's like cake, only universal.

Although gelatinous animals might seem like simple creatures, they'll probably outlast the rest of us, because being gelatinous might turn out to be the ultimate survival strategy.

What can we learn from the slimy, smelly side of life? In this playful talk, science journalist Anna Rothschild shows us the hidden wisdom of "gross stuff" and explains why avoiding the creepy underbelly of nature, medicine and...

Necessity is the mother of invention, right? Well, not always. Steven Johnson shows us how some of the most transformative ideas and technologies, like the computer, didn't emerge out of necessity at all but instead from the strange...

When Lesley Hazleton was writing a biography of Muhammad, she was struck by something: The night he received the revelation of the Koran, according to early accounts, his first reaction was doubt, awe, even fear. And yet this experience...

I’t teach an old dog new tricks — but that saying might not be as trustworthy as you’d think.

How do we find fulfillment in a world that's constantly changing? Raymond Tang struggled with this question until he came across the ancient Chinese philosophy of the Tao Te Ching. In it, he found a passage comparing goodness to water,...

Wheezy Waiter announces the SciShow nominees for "Worst Science in a Film," & Hank talks about the bird flu and shares two sounds that had never been heard by human ears until very recently.

Hank fixes those of us who are probably wrong about what is and is not a dinosaur... and gives a refresher to those of us who do know this already.

Building a perfect igloo takes cool science!

Medical animator David Bolinsky presents 3 minutes of stunning animation that show the bustling life inside a cell.

Comedian Aparna Nancherla loves to take out the trash. In this funny and sharp meditation on garbage -- "the stuff that our modern, consumerist, carbon-powered culture makes us buy endlessly, and often for no reason" -- she shares...

When talking about the brain, neurons have been dazzling scientists for a long time. But behind every successful neuron is a glial cell - particularly one type of them: microglia.

Growing up in a violent household creates the risk of perpetuating that violence later in life, but is it avoidable?

Relativity Isn't Relative

Memory foam, air purifiers, scratch-resistant lenses: these are just a few of the everyday items originally developed for space missions. Aerospace engineer Eric Hinterman invites us to dream big and imagine what technological...

The human brain is one of the most sophisticated organs in the world, a supercomputer made of billions of neurons that control all of our senses, thoughts, and actions. But there was something Charles Darwin found even more impressive:...

Our immune systems aren't just critical to our physical health. It turns out they may play a big role in our mental health, as well. And learning more about how these two aspects of our health are interconnected can help us develop...

Peering into the eyes of different animals, you'll see some extraordinarily shaped pupils. House cats, for one, are twilight hunters with vertically elongated pupils. Many grazing animals, like goats, have rectangular pupils. Other...

On top of our heads, there is a type of yeast that lives and dines on all of our scalps. Feasting constantly, it's in paradise. And in about half of the human population, its activity causes dandruff. So, why do some people have more...