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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The horizontal fraction bar was introduced by the Arabs.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
![Bronchoscopy. Figure illustrates physician using a bronchoscope to inspect the patient’s bronchial t](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_8493756.jpeg)
![Continuous positive airway pressure (CPAP) device. The sleeping subject is receiving the benefits of](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_25_45_10061802.jpeg)