› added 6 years ago

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TIL Traffic lights switching to LEDs aren't warm enough to melt snow, causing traffic issues.

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via reddit.com

8eBY4 TIL the word "Lord" is derived from an old English word that means bread keeper; as leaders were responsible for providing their community with food back then
7rxDp TIL that a cup of coffee should be 57.8 °C while drinking to minimize hazards and maximize flavour
w4VE TIL That people born blind use the same facial expressions as sighted people when expressing emotions, meaning that our facial expressions are innate and not learned behaviour.
6l9X TIL: all female placental mammals menstruate, but only female humans, bats, elephant shrews and some primate species bleed, which is called overt menstruation. Other mammals completely reabsorb the endometrium in what is known as covert or ‘true’ menstruation.
69B78 TIL that the precursor to LASIK, Radial Keratotomy, where operations to correct vision would be done “manually with a blade”, often led to many issues, such as vision loss and infection because the incision remains open indefinitely. "It is well documented that RK incisions never completely heal..."