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Did you know?
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 first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.