In 1976, fourteen banks merged to form a bank credit card called "Mastercharge." This was later renamed to what is now know as "Mastercard."

After the Krakatoa volcano eruption in 1883 in Indonesia, many people reported that, because of the dust, the sunset appeared green and the moon blue. The moon was said to appear blue for almost two years.

The "save" icon on Microsoft Word shows a floppy disk with the shutter on backwards.

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