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There are more sensory neurons in the tongue than in any other part of the body.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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The average adult has about 21 square feet of skin.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
![Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int](https://biology-forums.com/gallery/47/medium_12359_17_05_12_12_46_12.jpeg)
![In early industrialization, children worked alongside adults. They worked 12 hours a day Monday to ...](https://biology-forums.com/gallery/27/medium_660366_13_04_17_6_20_49_27692552.png)