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Hong Kong-based students, Sum Ming Wong and Kin Pong Li designed a door handle that uses light to always keep itself sterilized. The students were inspired by the SARS outbreak in the 2000s and figured that a self-sanitizing door handle is more effective than the chemical-based cleaning processes we are using right now. The handle is made of a glass tube with aluminum caps at each end and the entire handle is covered in a powdered photocatalytic coating made from a mineral called titanium dioxide. The bacteria is decomposed through a chemical reaction that is activated by UV light reacting with the thin coating on the glass tube.

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rN9r0 TIL about Rogers' Rangers, an independent ranger company attached to the British Army during the Seven Years' War. The Rangers disbanded in 1761 only to be revived as a Loyalist force during the American Revolution, with the US Army Rangers and Queen's York Rangers claiming descent.
l7xWr TIL two aviation incidents happened where superstitious, inexperienced passengers tried to throw coins into the plane's engines for good luck before the flight.
6EM7Z TIL that Mr. Rogers was bisexual, quoted as saying, regarding sexuality on a 1-10 scale, “Well, you know, I must be right smack in the middle. Because I have found women attractive, and I have found men attractive.”
PYN4E TIL that clowns play an important role in traditional Hopi religious festivals, representing man in his original uncivilized state. By acting outrageously they serve as an example of how not to behave. They also use satire and humor to criticize individuals who have violated community norms.
nexEG TIL The first two stealth aircraft were made by a handful of engineers in just 6 weeks while their workforce was on strike. The design used spare parts left over from other programs, and cost only $35 million.