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Author Question: The average life expectancy in the U.S. is almost _______ years; in Sierra Leone, it is ______ ... (Read 47 times) |
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Medication errors are more common among seriously ill patients than with those with minor conditions.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.