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There are approximately 3 million unintended pregnancies in the United States each year.
Vaccines prevent between 2.5 and 4 million deaths every year.
The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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).
![Forest fragments left by clear-cutting forest from the surrounding landscape have very different phy](https://biology-forums.com/gallery/47/medium_33_19_02_12_5_42_32_2064795.jpeg)
![Left: This web was woven by a 17-day-old spider, showing regular patterns. Right: This web was woven](https://biology-forums.com/gallery/47/medium_12359_03_04_12_3_07_11.jpeg)