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Author Question: Bell Telephone Laboratories invented the ________, which replaced the vacuum tube. (Read 319 times) |
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Your heart beats over 36 million times a year.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.