Monotremes, like the platypus, lay eggs and don't have placentas. So how does the mother's body know when to start lactating?
Here’s a question for the males out there. If there existed a birth control pill for men, would you take it? Learn more on this Moment of Science.
Depo-provera is the brand name of a method of birth control that consists mostly of a hormone much like progesterone, a hormone that works with estrogen to regulate the menstrual cycle.