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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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There are more sensory neurons in the tongue than in any other part of the body.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.