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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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The longest a person has survived after a heart transplant is 24 years.
![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)
![The “Big Four” world leaders meet at the Hotel Crillon in Paris, 1919. From left to right (front row](https://biology-forums.com/gallery/47/medium_4_23_06_16_8_41_01_236271811.jpeg)