"At Aperture, we bring the universe down to Earth and explore the human condition" ...

Read these 11 fun facts and you’ll know why: 1. The body has billions of nerve cells ... numbers of the axons and dendrites can vary. The human nervous system is defined as two parts.

What do you know about the endocrine system? In school, we learned that hormones and the glands that produce them comprise ...

Test your smarts against this one-minute video, where Ask Smithsonian host Eric Schulze uncovers the facts behind five popular myths about the human body. 3play_processed Ask Smithsonian Explore ...