> The vast majority of people who know the constant of gravity never measured it for example, they just work with what someone told them In the U.S., at least,

> The vast majority of people who know the constant of gravity never measured it for example, they just work with what someone told them In the U.S., at least, this is not true. Middle school and high school physics curricula include experiments to measure gravitational acceleration, so in theory (to the extent curricula are followed and students are present), almost everyone has measured it at least once.