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TIL before going down the ladder of the lunar lander, Neil Armstrong threw a bag of trash on the moon. It then became the subject of the very first photograph he took on the moons surface.

Read more nasa.gov

via reddit.com

818X TIL in Zagreb, Croatia there is replication of all 9 planets (at the time) sizes and distances in the same scale as Sun. In 2004. there was a scavenger hunt to find them beacuse the locations were unknown
eJG4 TIL in 2014 a Chinese company built 10 one-story homes in 24 hours using 3D printing technology. Each 2,100 square-foot building costs less than $5,000 to construct. The builder hopes the company’s 3D-printing technology will one day be used to build skyscrapers.
wLxnE TIL Shanghai's Tongji University started as the German Medical School in Shanghai in 1907 with funding from the German government. It became a university in 1923, receiving its funding direct from the Chinese government
JYkVl TIL of "Sputnikfest" an annual celebration held in the city of Manitowoc, WI where people dress up as aliens and science fiction characters to commemorate a 20lb piece of a Russian satellite crashing down in the city back in 1962
9O6M TIL Atari programmers met with Atari CEO Ray Kassar in May 1979 to demand that the company treat developers as record labels treated musicians, with royalties and their names on game boxes. Kaplan said no and that “anyone can do a cartridge.” So the programmers left Atari and founded Activision