› added 3 years ago

83

TIL that no one has ever measured the one-way speed of light. In fact it is undefined. All measurements of light speed are done using two-way (mirror) setups. It is entirely possible that light travels at c from A to B, and instantaneously from B to A, for a round trip speed of c.

Read more wikipedia.org

via reddit.com

9Y8PG TIL of the Radium Girls, young women who worked by painting clock dials using glow in the dark radium paints. Because they sucked the brush to make them pointier, they were exposed to massive amounts of radiation, some suffering debilitating diseases that eventually killed them.
OGMR7 TIL Steven Spielberg filmed both Jurassic Park and Schindler's List in the same year, 1993. For help, Spielberg asked George Lucas to finish post production sound on Jurassic Park and the film won best sound at the Academy Awards.
rRKlw TIL that in 1958, Bank of America mass mailed 60,000 unsolicited credit cards, with a credit line of $500, to residents of Fresno, California. They chose Fresno so that if the plan failed, it wouldn’t get much media coverage. The program was wildly successful and marked the birth of Visa.
Br7WK TIL Matthew McConaughey’s father told him “When I go, it’ll be makin’ love to your mother.” Sure enough, the prediction came true and he passed away having sex at 3am on a Monday morning.
LQWLZ TIL that “The Chipmunk Song (Christmas Don’t Be Late)” by Alvin & the Chipmunks was the only Christmas song to ever top the Billboard Hot 100 until Mariah Carey’s “All I Want For Christmas Is You” did so 61 years later.