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TIL that in 1931 Albert Einstein sent a letter to Sigmund Freud titled "Why War?" to better understand the psychological causes of war. Freud responded that biological evolution, inherent power differences within groups, and the paradox of peace (times of peace allow empires to be built) cause war.

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R5kN8 TIL about the Zimmermann Telegram, a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico if the USA entered World War I against Germany. The telegram was intercepted by British intelligence.
04AR TIL that people living within 2000 meters of an airport have higher levels of lead in their blood, which is linked to lower IQ in children and a host of diseases. Unlike cars and commercial airplanes, recreational airplanes still use leaded fuel.
kOJEW TIL The best selling drink in every country on Earth is either Coca-cola or a drink owned by the Coca-Cola company - except for one place. Scotlands own 'Irn-Bru'. It has been the most dominant soft drink in Scotland for a century.
PY1GO TIL Radox Spa commissioned a study to find the Top 9 most relaxing songs. The British Academy of Sound Therapy then teamed w/ Marconi Union to scientifically create the most calming song called Weightless. Using entrainment, your heart rate slows, and specific harmonic intervals create euphoria.
PePZ TIL The most profitable movie of all time is My Big Fat Greek Wedding, with a 6150% return on investment