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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.