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The horizontal fraction bar was introduced by the Arabs.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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.