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Did you know?
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.