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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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).
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
![Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_27_39_94342192.jpeg)
![New England children like David, Joanna, and Abigail Mason (painted by an unknown artist around 1670](https://biology-forums.com/gallery/47/medium_374628_15_08_15_11_48_07_222261695.jpeg)