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TIL prior to the announcement of the Mach3 razor blade in the late 90s, Gillette built plywood walls around the production lines in its factory in Boston, in order to keep it a secret from many of its own employees.

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16RVr TIL After water, concrete is the most widely used substance on Earth. If the cement industry were a country, it would be the third largest carbon dioxide emitter in the world with up to 2.8bn tonnes, surpassed only by China and the US. [2018 numbers]
8em9X TIL that the Worshipful Company of Horners - an ancient London guild from 1284 or earlier - made horn goods. As horn work declined, they merged with leather bottle-makers in 1476. In 1943, the company decided to support the plastics industry.
rRAB4 TIL bumblebees are capable of flying at altitudes much higher than Mount Everest. Two bumblebees were placed inside a plexiglass chamber and were able to reach a simulated altitude of 29,525 ft with air pressure being reduced. The chamber kept breaking before the bumblebees stopped flying.
DkWv TIL - A drunk driver that killed a little girl was court ordered as part of his sentence to write a check to the victims family every week for 10 years to remind himself of the tragedy he caused.
0wdwj TIL In the skies over Germany in WWII, a badly damaged American B-17 was escorted out of enemy airspace by a German fighter ace who could've easily shot them down. Years later after the war, Charlie Brown and Franz Stigler reunited and became lifelong friends.