This Tiny Doll is Anatomically Correct All The Way In

If you were a midwife or a doctor attending childbirths during the 17th century, you might have owned a tiny anatomically correct doll like this one. Carved from ivory by German, French or Italian craftsmen, these tiny anatomical manikins opened to reveal the normal arrangement of human organs, including the lungs,… » 5/05/15 4:56pm 5/05/15 4:56pm

How Do Testicles Know When To Stop Making More Sperm?

Every time someone ejaculates, it produces millions of sperm. But the average pair of testicles produces billions of sperm cells over an entire lifetime. Why don’t they create all of their sperm in one go? Answer: Because testicles have a complicated process to avoid running out of sperm and endangering future… » 5/04/15 4:06pm 5/04/15 4:06pm