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Bro… Brooooooo… I’m jealous of your faith in the american education system.
I learned it in First Grade and nearly everyone I have talked to did as well, and I am in California which is rated as the #40 best state for public education, which puts me technically near the bottom. So unless someone happens to come from a state that is lower than California (10 states in descending order where last is worst: TN, FL, NC, OK, SC, AL, NM, NV, LA, or AZ), then chances are very tiny that they were not taught that basic fact in grade school, which was then repeatedly used in every science class afterwards.