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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?
The horizontal fraction bar was introduced by the Arabs.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Did you know?
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
Did you know?
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

