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TIL there's 20-40x less oxygen in water than air.

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PYoNO TIL About Einstein's "Year of Miracles". In one year he published 3 papers that changed modern physics. The first about the particle theory of light (won him his Nobel Prize), the second led to people accepting the existence of atoms, and the third introduced special relativity (E=mc^2). He was 26.
Wkgpo TIL that a company in Tokyo decided to make their HQ into a vertical farm. They gave up 43,000 square feet of space to grow food. 200 species of fruits and vegetables are harvested and served to employees. There is a 1000-square-ft rice paddy in the entryway.
LkgV TIL a counter-terrorism expert in the FBI continuously warned of an impending Al-Qaeda terrorist attack 5-6 years prior to 9/11. He was pushed out of the FBI in 2001 and took a job as security head in August..at the WTC where he died when the towers fell.
J1NxQ TIL: Banks in Finland stopped issuing cheques in 1993, The Netherlands in 2002 and Denmark in 2017.
XEArE TIL of Hussain al-Shahristani. An Iraqi who was forced into solitary confinement in prison for 8 years under Saddam Hussein. He kept his sanity by “making up mathematical problems, which he then tried to solve.” He later became Iraq’s minister of higher education and scientific research.