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TIL Sgt. Pepper's Lonely Hearts Club Band was the first album to feature printed lyrics on it's sleeve. Previously, printed lyrics was seen by music publishers as a substantial loss of income.

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J1AJv TIL the "Red Phone", which linked Washington to Moscow wasn't red, or even a phone. It was teletype when the system started in 1963, switched to fax in 1986, and secure email since 2008.
6EbD7 TIL Yuan Shikai was elected the first official president of the Republic of China, and was active in establishing modern industrial, judicial and educational systems as well as unifying the currency. As a young man, Yuan was also sent to Korea as supreme adviser on Korean government policies
Y7LQ7 TIL James Longstreet, one of the foremost Confederate generals of the American Civil War and the principal subordinate to General Lee, became an anathema to many Confederates post-war due to his support for the Republican Party as well as critical comments he wrote about Lee's wartime performance
kO0xg TIL Goodhart's Law, the principle that when a measure becomes a target, it ceases to be a good measure. For example, when a government tries to bring down unemployment figures to demonstrate how well the economy is doing, unemployment figures stop being a good measure of the economy.
59Dn TIL that lobsters are functionally immortal. They show no measurable signs of aging (no loss of appetite, no change in metabolism, no loss of reproductive urge or ability, no decline in strength or health), and seem to only die from external causes.