You might have heard that a quarter of your skeleton is in your shoes, and that's true, as long as they're closed-toe. So why do we need that many foot bones? The answer is more complicated than you think, and to get to the bottom of...

Ever wonder why we aren’t exact clones of our parents, or why siblings aren’t exactly alike? The reason traces back to meiosis. In this episode of Crash Course Biology, we’ll discover how egg and sperm cells get made and learn why you’re...

Horse plus donkey — it seems like an unlikely combination. I mean, they're different species! And yet, when they get together, they can produce a mule or the lesser-known hinny. Either way, those offspring usually can't become parents...

Until the early 20th century, Tasmania was home to a very weird wolf-like creature. Except that it wasn't a wolf. Even though it looked like a wolf. How did that happen? Here's the science of convergent evolution!

In this video, Jonathan from the Institute of Human Anatomy discusses how a female erection works by going over the relevant anatomy and physiology, as well as compares it to male erectile function, and if female erection and climax can...

A video entitled “The Evidence for Evolution” which explores the origin of Charles Darwin’s theory of evolution and then focuses on the evidence used to study and support Darwin’s theory.

Developmental Set: 2. This clip explains the concept of developmental homology in embryonic fetal development.