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Author Question: What is meant by background knowledge? What will be an ideal ... (Read 34 times) |
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.