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Did you know?
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.