Marathon runners experience reversible changes in their brain myelin. These findings indicate that myelin (a substance that surrounds the neurons) exhibits behavior that was previously unknown, and ...

That second wave of energy is a normal part of the human circadian rhythm, but lifestyle factors also play a role.

Spermicide works best if you use it correctly every time you have sex, which is difficult for some people to do. Spermicide can also have side effects. You have to use it every time you have sex. In ...