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If you could remove all of your skin, it would weigh up to 5 pounds.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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.
There are approximately 3 million unintended pregnancies in the United States each year.