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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.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
![This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p](https://biology-forums.com/gallery/47/medium_374628_15_08_15_11_50_51_22235741.jpeg)
![Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken](https://biology-forums.com/gallery/47/medium_27_24_08_15_1_42_56_22412771.jpeg)