"Thales of Miletus... one of the "seven wise men" of early Greece, is credited with the knowledge that amber, when rubbed, will attract light bodies, and that a certain mineral, now called magnetite, or loadstone, possesses the power of attracting iron."
January 1, 1970
https://en.wikiquote.org/wiki/A_History_of_Physics_in_its_Elementary_Branches