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The human body produces and destroys 15 million blood cells every second.

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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.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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