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TIL that there are only 10 people in the world who have achieved the 'Explorer's Grand Slam' - reaching the North and South Pole and climbing the highest mountain on each continent.

Read more explorersgrandslam.com

via reddit.com

oRZR8 TIL that a woman living in California in the 1940s housed thousands of spiders in her home to harvest and sell their silk to the US military for bomb sites during WW2. The government's couriers would arrive to pick up the silk with empty briefcases handcuffed to their wrists.
v1OwR TIL skateboard legend, Tony Hawk was tested to have an IQ of 144.
8aLK8 TIL that equisetum, or puzzlegrass, inspired the invention of logarithms
rjBe TIL in 2007, a nine-year-old Jack Russell Terrier named George sacrificed himself to save five children from an attack by two Pit Bulls. All three dogs had to be euthanized, but George was posthumously awarded a PDSA Gold Medal and his heroism was commemorated with a bronze statue.
78ORr TIL sodium citrate can be used as an emulsifying stabilizer when making cheese and allows the cheese to melt without becoming greasy by stopping the fats from separating. Melted cheese is often used on nachos and has the chemical formula of Na3C6H5O7.