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In 1937, the U.S. Army Air Corps began research flights in a modified Lockheed Electra; the XC-35 was the first airplane built with a pressurized cabin.

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Me7bK TIL that arguably the person credited with saving the most lives in human history is WWI chemical weapons scientist, Fritz Haber. His work directly lead to the deaths of hundreds of thousands during the war, while accidentally saving billions from starvation by developing a way to convert N2 to NH3.
AVrw TIL that those iconic X-shaped fortifications on the beaches at D-day were designed to tear open the bottoms of landing craft. The attack was expected to come at high tide, when they would be hidden under the water.
grAJ4 TIL Michelle Philpots suffered traumatic brain injuries after two motor vehicle accidents in 1985 & 1990. In 1994, epilepsy developed & led to anterograde amnesia. Each day, she wakes up believing it's still '94 & her husband has to convince her of their 1997 marriage using a photo album as proof.
D11Mr Even small amounts of vigorous exercise could significantly lower a person’s risk of dying prematurely, according to a large-scale new study of exercise and mortality.
BEpK TILed that there is a geocache on the International Space Station.