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TIL that in 1987, FBI agent Robert Hanssen was tasked by his superiors to find a mole within the agency after the FBI’s moles in the KGB were caught. In reality, he was the mole, working with the KGB since 1979.

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R5Vaj TIL that with regard to a 24 hour day, divided into two periods, a.m. comes from the Latin ante meridiem, translating to "before midday", and p.m. from the Latin post meridiem, which translates to "after midday."
P1LyZ TIL that the first Norman castle in England was built 15 years before the Norman Conquest
78l6b TIL there was a 22-percent increase in productivity among workers who had been given glasses and those over 50, productivity increased by nearly 32 percent.
PYyjn TIL the Superb Lyrebird has the ability to mimic any natural and artificial sounds from their environment with astounding accuracy. In this video one imitates the sounds of a Kookaburra, camera shutter, camera with a motor drive, car alarm and chainsaw.
dwLd TIL that thanks to Tsunami, existence of 6 temples dated 7th century AD in Mahabalipuram, India was discovered in 2005