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TIL Keyboard instrument already exist since the third century BC. The earliest known keyboard instrument was the Ancient Greek hydraulis, a type of pipe organ invented by Ctesibius of Alexandria.

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W70X8 TIL that the metal band Black Sabbath's first album, "Black Sabbath", received generally negative reviews from contemporary critics. Today, the album is considered to be excellent, innovative, and highly influential.
Onge TIL the name of the stretchy glue that holds new credit cards to the paper is called Fugitive Glue.
wLdRM TIL of the word kleptocracy, which is a government with corrupt leaders that use their power and position to advance their own personal wealth.
N7xNN TIL Dropbox mobile app can scan documents to PDF and is doing this much faster and easier than Gdrive App
9PD TIL that athletes can compete as independent Olympians (not under a country’s flag) at the Olympic Games