Amazing Facts Most People Don't Know
Electric vehicles are so quiet that they have systems to generate artificial engine sounds for safety.Source

Astronauts can grow up to 2" taller during their time in space due to the elongation of their spine in microgravity.Source

In Japan, '39' is common text speak for 'thank you', due to how 3 (san) and 9 (kyu) sound when spoken out loud.Source

During the Cold War, CIA agents used a method of communication based on how their shoelaces were tied.Source
