Over our lifetimes, our bodies undergo a series of extraordinary metamorphoses: we grow, experience puberty, and many of us reproduce. Behind the scenes, the endocrine system works constantly to orchestrate these changes. Emma Bryce...

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.

Plants are constantly under attack. They face threats ranging from microscopic fungi to small herbivores like caterpillars, up to large herbivores like elephants. But plants are ready, with a whole series of internal and external...

Seedless watermelons are basically the best thing ever. But they’re also a delicious paradox. Seeds are a key part of plant reproduction. So how do you breed a plant that doesn’t make any seeds?

Why do apples turn brown after you cut them, or when they rot? Basically for the same reason that human hair, eyes and skin is brown, too. Not that we're calling you rotten. Quick Questions explains!

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!

If you want to be able to breathe underwater, you're going to need to get creative. So some turtles, dragonfly nymphs, and sea cucumbers decided to use their butts.

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

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Today we take a look at six misconceptions about cancer that seem plausible, but just don't hold up.

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Quick Questions explains what’s in those little packets you find in packaged food, bottles of pills, and leather goods, and why you should do what the label says and not eat them.

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

Your genome, every human's genome, consists of a unique DNA sequence of A's, T's, C's and G's that tell your cells how to operate. Thanks to technological advances, scientists are now able to know the sequence of letters that makes up an...

Quick Questions explains why, when it comes right down to it, there are really only eight kinds of people in the world.

The things we eat and drink on a daily basis can impact our health in big ways. Too many carbohydrates, for instance, can lead to insulin resistance, which is a major contributor to cardiovascular disease and Type 2 Diabetes. But what...

Learn how scientists are fighting cancer... with algae!

Our final episodes of Anatomy & Physiology explore the way your body keeps all that complex, intricate stuff alive and healthy -- your immune system. The immune system's responses begin with physical barriers like skin and mucous...

Mushrooms can be pretty weird! Some have the power to trick animals into caring for them, appear to bleed, or even clean up radiation!

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ank explains the gift that your brain gives you every day: the gift of neural plasticity -- the ways in which your brain actually changes at the cellular level as you learn.

Paul Andersen discusses the defining characteristics of the members of Domain Eukarya. He starts with a brief description of the phylogeny of life on earth. He then discusses the major characteristics of eukaryotic cells. He explains...

Biology textbooks are full of drawings of DNA, but none of those show what DNA actually looks like. Sure, they're good models for understanding how DNA works, but inside of real cells, it's a whole lot more interesting. Learn why we...

Epigenetics: Why Inheritance Is Weirder Than We Thought

Paul Andersen explains the importance and location of interstitial fluid. He describes both the hydrostatic and osmotic pressures that move fluid between the interstitial fluid and the capillary. He also explains the major function of...

Scientists have had a variety of hypotheses about how chemical stress can affect DNA to cause aging, but a new study has just shown the process in action.