› added 6 years ago

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TIL that H.H. Holmes, considered the first American serial killer, build a whole hotel with secret rooms for murder ant torture purposes, where more than 200 victims could have been killed.

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via reddit.com

8bbV TIL that the smell when it first starts raining is called Petrichor. It is a combination of plant oils and the chemical Geosin. New research has shown that when the rain drops hit the ground they trap tiny air bubbles, which then shoot upwards creating an aerosol.
kJ84W TIL it wasn't until the 19th century that a physician to Louis XVIII correlated the chemistry of a toxin with the biological effects it produces in a poisoned individual.
gMd4b TIL: In 2015, researchers testing the efficiency of mosquito repellents used a Victoria’s Secret perfume because they thought the floral fragrance would attract mosquitoes. To their surprise, they found it repels mosquitoes better than a range of mosquito deterrents.
p87vO TIL tech companies in China hire "programming cheerleaders", pretty women that cheer up the programmers as they work at their desk. They need to know how to put on makeup, to be taller than 5'2, to have a "gentle voice", and a "contagious laugh".
OGgYX TIL that 160 years ago Colonel Robert Gould Shaw and many more members of the 54th Massachusetts Infantry Regiment were killed during the American Civil War, in an attack on confederate stronghold Fort Wagner. They were one of the first African American regiments in the war.