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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.