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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
Did you know?
Everyone has one nostril that is larger than the other.

