npr.org

grnVb TIL: That during the Apollo 11 moon landing, Neil Armstrong was the only one operating the Hasselbad camera and almost all pictures he took were of Buzz Aldrin, NASA could only find 1 picture of Armstrong taken by Aldrin (who was busy with experiments) on that fateful day
dDrmj TIL That Helium is the only element that is completely non-renewable, and we're rapidly running out of it - which is a big issue, as Helium is used heavily in the scientific community
a8BgL TIL the smoot is a unit of measure named for Oliver R. Smoot, an MIT student who as a fraternity pledge was forced to measure the Harvard Bridge using himself as a ruler. A smoot is equal to five feet, seven inches.