› added 1 year ago

100

Today I Learned about The Science of Copper Manufacturing and How It Goes From an Ore to A Wire.

Read more youtu.be

via reddit.com

opW8 TIL that the U.S. military is building a stealth bike with an electric battery, capable of silent operation for covert missions
R7j09 TIL A toothpaste was sold in early 20th century Germany which was slightly radioactive because it contained small amounts of thorium. Its radioactivity was promoted as imparting health benefits and the product is exemplary of the radioactive quackery which thrived in those times
BrxRk TIL Elena N. Bodnar has a US Patent for inventing a brassiere, that in an emergency, can act as a pair of protective face masks and she was awarded the Ig Nobel Public Health Prize for it in 2009.
GAJw7 TIL that birds control the shape of their wings during flight using hook-shaped microstructures in their feathers to prevent them spreading too far apart. The detachment of the hooks is noisy, so they are missing from silent fliers such as barn owls.
N717N TIL that Seneca, the Stoic philosopher defined happiness as a state where's nothing missing and you enjoying the present moment without anxious dependence upon the future.