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TIL Delhi, India is the most surveilled city in the world with 1,826.6 CCTV cameras per square mile

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VM7vB TIL Angelina Jolie had a mastectomy due to having an 87% risk of breast cancer and a 50% risk of ovarian cancer. Her chance of developing breast cancer dropped from 87% to under 5% after the mastectomy.
AxOl TIL scientists have been working on a mosquito-killing laser that can kill up to 100 mosquitos a second. The system can even distinguish gender and species by calculating the speed at which their wings beat.
4k9Ka TIL that the plumber wrench and the adjustable wrench were both invented by the same person, a Swede from a family of tenant farmers.
Z8alB TIL that blood from horseshoe crabs is harvested every year and is the single best way to test for bacterial toxins in the manufacture of any medical substance or device put into the human body.
wLxyE TIL Only in the U.S. and New Zealand is direct-to-consumer advertising of prescription drugs legal.