Problematic pregnancies that required assistance revolutionized child delivery for early humans.
There's one da Vinci of the body, a true Renaissance organ, which can perform functions of the lungs, liver, stomach and kidneys.
In 2001 a shark was born at a zoo in Nebraska. The birth might not have been newsworthy, except that baby appeared in a tank with three female sharks.
What are the odds of giving birth to a boy? Learn more on this Moment of Science.