Ivory soap slogan "99-44/100% Pure" was cleverly invented by Harley Proctor who with the help of chemists determined that Ivory soap was only 56/100 pure. Proctor simply subtracted 56 from 100 and came up with "99-44/100% Pure".

The iron disulfide (Pyrite) is considered "fool's gold" because it looks very similar to gold.

An ant can lift 50 times its own weight.

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