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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
![Lithotripsy. The direction of a sound pulse crushes the stones into smaller fragments that can be pa](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_21_06_96701032.jpeg)
![Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_14_26_10024713.jpeg)