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Learn about the science and symptoms of a woman's 9-month pregnancy. Explore the science behind the body's greatest mysteries -- in two minutes flat.

Zac Efron and Lily Collins take a friendship test. Lily and Zac star in "Extremely Wicked, Incredibly Evil," now streaming on Netflix. Still haven't s...

Learn about the science and symptoms of a woman's 28-day menstrual cycle, hormones & period. Explore the science behind the body's greatest mysteries ...