Electromagnetism in science and technology - Richard Feynman
Let me point out that among the many phenomena studied by the Greeks there were two very strange ones: that if you rubbed a piece of amber you could lift up little pieces of papyrus, and that there was a strange rock from the land of Magnesia which attracted iron. It is amazing to think that these were the only phenomena known to the Greeks in which the effects of electricity or magnetism were apparent.
אמן על פי ציטוט זה
ערוך טקסט
או פשוט השאר תגובה:
