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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.
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.
Vaccines prevent between 2.5 and 4 million deaths every year.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.