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TIL Velcro is the name brand of Hook and Loop Fastener. It was invented in the 40s by a Swiss engineer and patterned after cockleburrs, burdock seeds that would stick to his pants and in his dog's fur. He looked at them under a microscope and was inspired to recreate it.

E18rd TIL that although Dr. Dre is credited as writing "Still D.R.E.", it was actually ghostwritten entirely by Jay-Z
80ma TIL researchers found that facial distinctiveness, considered less attractive, was linked to poor health in both men and women. Facial averageness, on the other hand, was linked to good health. One theory is that distinctive facial traits are tied to chromosomal disorders.
JYxA8 TIL that in terms of the average number of steps required to link actors to other actors, Kevin Bacon is only the 543rd ranked actor in Hollywood history. The actors with the lowest average number of steps are Christopher Lee, Harvey Keitel, Christopher Plummer, Michael Caine, and Donald Sutherland
NyK6 TIL in 2013 a female professor attempted to give a public lecture on men’s rights at the University of Ottawa. 30 protesters harassed the meeting with megaphones outside until they were forced to change rooms, at which point the protesters pulled a fire alarm to force an evacuation of the lecture.
wLpQ1 TIL: In 2015, HitchBOT, a cheerful hitchhiking robot which was dependent on strangers to reach its destination as an experiment, managed to travel across the Netherlands, Canada, and Germany. It was beheaded after two weeks in the US after it ventured into Philadelphia.