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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.