the gravity of a substance depends not on the amount of its weight, but on its nature.
Chapter VIII, Sec. 3 - De architectura (The Ten Books On Architecture) (~ 15BC) - Book VII
the gravity of a substance depends not on the amount of its weight, but on its nature.
Chapter VIII, Sec. 3 - De architectura (The Ten Books On Architecture) (~ 15BC) - Book VII