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TIL about Mary Mallon, an asymptomatic carrier of typhoid, who spread it in New York city in the 1900s. Dr. George Soper discovered every establishment she worked in as a cook had an outbreak of typhoid and warned her to wash her hands but she ignored him and continued to spread it all over the city

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5VQpQ TIL beneath the Puerto Rico Trench is a mass so dense it has a gravitational pull on the surface of the ocean, causing it to dip somewhat. The Trench is also associated with the most negative gravity anomaly on earth, -380 milliGal, which indicates the presence of an active downward force.
8ad7a TIL North Korea, "world's worst Internet black hole," restricts Internet access to high-level Party officials and then only "to browse fan pages of the leading Kim dynasty"; in response, "North Koreans [are] buying properties close to foreign embassies in a bid to access their wifi."
pdn8 TIL that if you don’t sleep, your brain cells soak in their own filth. Sleep may clear out nervous system metabolites, which are waste products that can be toxic.
ODeg TIL Major banks like UBS, HSBC, and Barclays have been submitting phony numbers, often in concert with each other for years. Together they manipulated world markets, specifically the Libor rate, which controls interest rates worldwide, causing trillions in damage. No banker will spend a day in jail.
4k11o TIL: during his exile in UK, one of the activity of former French Emperor Napoleon III is designed a more energy efficient stove