› added 1 year ago

89

TIL: about explosion welding. First observed during WW1 when shrapnel wasn't just stuck but welded. Now done in controlled sheets for comercial material.

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OA04 TIL that in 2011 it was revealed that the US have a spy operation that manipulates social media (including sites like Reddit, incase you hadn’t already noticed….)
7PaM TIL- London is now the financial capital of the world, no longer New York City
eRP5 TIL that the bulbs used in fire sprinkler systems are color-coded to represent the temperature required for the sprinklers to be activated.
9YV0Q TIL France has a law allowing colleagues to gift days off for parents of seriously ill children
ly67 TIL In the month before the ancient Olympics no wars were permitted so that spectators could travel from across Greece unharmed,