You can dye your hair, you can get a tan, but the color of your eyes is pretty much set in stone - or is it? From weird diseases to temper flare-ups and even iris implants, here are just a few ways that your eye color might not be so...

Many patients experience changes to hair texture after chemotherapy known as "chemo curls." But why do they happen, and how many people get chemo curls? This episode will explain.

In today's episode Hank talks about hair: What's it good for, what's it made of, and why do we have less than other mammals?

People ask Google everything under the sun. One of the most commonly searched questions in the world is “How do I grow a beard?”? Let SciShow explain.

Few mammals actually get periods every month, or even at all, but why? Understanding what menstruation really is and why it happens could help ease symptoms & treat conditions that stem from the reproductive system.

Hair can be so many different colors, but why do so many adults have gray hair?

People ask Google everything under the sun. One of the most commonly searched questions in the world is “How do I grow a beard?”? Let SciShow explain.

Just like the myth that plucking one gray hair will make three sprout, stress making your hair white isn't actually a thing. Or is it?!

In today's episode Hank talks about hair: What's it good for, what's it made of, and why do we have less than other mammals?

All mammals have hair at some point in their lives, but none of them wear it quite like humans. Why does our hair grow where it does, and not grow where it doesn't? How does our hair get its color? And why does it go gray and often fall...

Clinical Sexologist and Sexplanations Host Lindsey Doe teaches Hank the difference between HIV and AIDS. Then Chinchilla Ash teaches Hank about softness.

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Infertility affects 1 in 8 couples worldwide. But in the last 40 years, more than 5 million babies have been born using in vitro fertilization (IVF). How does it work? Nassim Assefi and Brian A. Levine detail the science behind making a...

At this moment, three hundred million women across the planet are experiencing the same thing: a period. The monthly menstrual cycle that gives rise to the period is a reality that most women on Earth will go through in their lives. But...

The hair on your scalp can get really long, but your leg hair doesn't sweep the floor. Why not?

Human reproduction is complicated an important, and it's going to take a four part series for us to cover it. Today, we're kicking that off with the female reproductive system, starting with how sex hormones affect oogenesis and...

Howcast - Learn what laser hair removal is from Completely Bare owner (and former Real Housewife of New York City) Cindy Barshop in this Howcast video.

Howcast - Learn how to remove stomach hair from Completely Bare owner (and former Real Housewife of New York City) Cindy Barshop in this Howcast video.

Howcast - Learn about permanent hair removal from Completely Bare owner (and former Real Housewife of New York City) Cindy Barshop in this Howcast video.

Howcast - Learn the best hair removal method for your skin and hair from Completely Bare owner (and former Real Housewife) Cindy Barshop in this Howcast video.

Learn hair anatomy of the human hair by KLT

Jessi shares what Chinchillas are, where the come from, and how to care for them in captivity. Featuring Cheerio the chinchilla!

Why do birds lose their feathers? What is molting? How can you help them through it? Jessi gives you all the answers helped by some of her feathered friends.

WHY DO WE LOSE OUR HAIR?

Do you inherit it from your mother? Does stress make your hair fall out? Can too much testosterone and even too much sex make you go bald? Join us as we quash some of the biggest myths, and investigate...

This video explores five fun facts about hair.