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The horizontal fraction bar was introduced by the Arabs.

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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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The longest a person has survived after a heart transplant is 24 years.

Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc
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A cancerous tumor growing within the milk gland. A cancerous tumor growing within the milk gland.
Tumor localization with radiolabeled anti-PSMA Tumor localization with radiolabeled anti-PSMA
How to common factor an expression How to common factor an expression
Because the factor h on the right side of the Heisenberg uncertainty principle has units of ... Because the factor h on the right side of the Heisenberg uncertainty principle has units of ...
Video: Polymerase chain reaction PCR - Animation

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