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Today I learned that when the President is unmarried or his wife dies during his term, another female relative will become the First Lady. Three president’s daughters, two president’s sisters, two nieces and two daughters-in-law have been First Lady.

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m1lDx TIL the very first case where John E Reid used his interrogation methods, which is widely used throughout North America today, got a false confession from a suspect for murder. Which later cost the state of Nebraska $500,000 after the real killer confessed.
AD6mw TIL that many Chinese soldiers that came into contact with protestors at Tiananmen Square refused to open fire on civilians. One official even refused to obey orders by pretending he didn't receive any messages. There was even infighting between the various units over violence against civilians.
6E96X You’re in luck. For their senior project, two Cornell University computer-engineering whizzes recently built a machine that does just that. After learning in class how breathalyzers work, Robert Clain and Miguel Salas assembled a fart detector from a sensitive hydrogen sulfide monitor, a thermometer and a microphone and wrote the software that would rate the emission. A “slight perturbance in the air” near the detector sets it to work measuring the three pillars of fart quality: stench, temperature and sound. Temperature, Clain explains, is critical.
1aRkD TIL Jimmy Carter was the first President born in a hospital.
6lvl TIL that 23% of the crew aboard Christopher Columbus’ ship “Santa Maria” was named “Juan”.