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Til In 1181, Chinese and Japanese astronomers recorded a “guest star” in their night sky. It is one of the earliest descriptions consistent with a supernova

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e9Ek TIL A man named Steve Schutz submitted himself to over 150,000 mosquito bites over twelve years to build up immunity. He no longer itches from mosquito bites
6EMGX TIL the Chinese referred to the Roman Empire as "Great China" (Daqin) because they thought of Rome as a civilized counterpart to the Chinese Empire, and describing: "Their kings are not permanent. They select and appoint the most worthy man. [...] The people of this country are all tall and honest."
D1DWJ TIL that after completing his 20 yr sentence in 2000, John Lennon's killer has been denied parole every 2 years since. Next parole hearing is Aug 2020.
GXmj TIL When ignored by that person whose attention means the most to you, the reaction in your brain is similar to physical pain.
4ka1X TIL that the Panopticon prison design used centrally positioned guards to create the illusion of constant surveillance, ensuring low-cost control over inmates behavior