How does one experience synesthesia -- the neurological trait that combines two or more senses? Synesthetes may taste the number 9 or attach a color to each day of the week. Richard E. Cytowic explains the fascinating world of entangled...

Hank shares news about two unusual animals in crisis: the saiga, which have lost about half of their total population in the past month, and the smalltooth sawfish which has been found to reproduce in the wild, without sex.

TOP 10 REASONS Why We Know the Earth is Round

Do We Have to Get Old and Die?

Stretched across a tree-peppered expanse in Southern Africa lies the ruins of Great Zimbabwe, a medieval stone city of astounding wealth. Located in the present-day country of Zimbabwe, it's the site of the second largest settlement...

You might have heard the myth that you can tell when someone is lying based on how their eyes move. While that is not exactly true, there has been plenty of science that looks into where and how we look when we think.

In this video Paul Andersen explains how waves interact when moving through one another. Unlike particles waves can interfere both constructively and destructively. The amount of interference is determined through the superposition...

Hank talks about the issues of rising global population.

Nachos are great...if you are among the lucky ones whose body can digest them. When digestion goes according to plan, the small intestine performs most of your chemical digestion in the duodenum, while accessory organs including...

Despite water covering 71% of the planet’s surface, more than half the world’s population endures extreme water scarcity for at least one month a year. Current estimates predict that by 2040, up to 20 more countries could be...

Nothing is guaranteed in life except death, taxes, and entropy. What do other life forms have to teach us about staying alive as we get old, and will we ever conquer death?

Did you know that bananas are berries, but strawberries aren't? A lot of thought goes into classifying fruits and vegetables, and it all has to do with anatomy.

In which Hank does some push ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodies create energy in the form of ATP.

Seymour might have had better luck had he raised one of these Bornean plants instead of a giant Venus flytrap. Instead of evolving to eat animals, they’ve evolved to play nice in exchange for their nutrient rich feces.

Your head feels too big and things just keep getting curiouser and curiouser. Did you step through the looking glass or is it a super rare neurological condition?

Choosing to marry and share your life with someone is one of the most important decisions you can make in life. But with divorce rates approaching fifty percent in some parts of the world, it's clear we could use some help picking a...

You probably have a vague idea of what sperm does, but not all sperm are created equal, and some have even developed unique adaptations to get where they're going.

You might have heard that bones are stronger after they break, which sounds ridiculous, but for a short period of time, it might be true!

Join Hank Green to learn ten weird, scary, and amazing things fungi can do!

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Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

Do you like drinking milk or chatting with your friends? Well, you can enjoy those because of the evolution happened over the past million years, and we are still evolving. Let's find out what will we be like in the future with us!

The Silent Generation, baby boomers, Generation X, millennials, Gen Z -- we're all in the workforce together. How are our assumptions about each other holding us back from working and communicating better? Social psychologist Leah...

Temper tantrums are more complex than just a toddler's unbridled rage. And recent research into what toddlers are thinking and feeling can help us better support kids’ healthy development!

You might already know that proteins are a fundamental part of your diet, but they're much more than that.