TIL That the term 'Superhero' is a trademark owned by Marvel and DC Comics, and competitors need to apply to them for a license to use it [source, comments]

TIL In 2003 Space Shuttle flight director knew that Columbia's Thermal Protection System was damaged but decided to not tell the crew. He thought it would be better for them to have a happy successful flight and die unexpectedly during entry than to stay in orbit with oxygen running out [source, comments]

Good Idea: Know how to limit your online footprint

https://www.wired.com/story/how-to-be-more-anonymous-online/

TIL that Gasoline is produced differently in summer and winter, which is why gas prices drop so steeply during the winter. [source, comments]

Today I learned, French automaker Citroën, sabotaged wartime Nazi truck production by moving the notch on the oil dipstick down. The engines would not have the correct amount of oil and prematurely fail. [source, comments]

TIL that dogs intentionally try to make humans laugh. They understand that laughter means play, and play is positive. [source, comments]