Leptonic Magnetic Monopole

While it certainly happened later than the observation of stars, the observation of electricity and magnetism began far in Antiquity, due to Greece and China. Some 600 years B.C., Thales noticed the faculty of amber to attract light bodies when rubbed with a cat skin. But the Greeks also knew about magnets, whose name is magnes in Greek. And thus, since amber is called elektron, they left us not only the observation of electromagnetism but also the etymology. The Chinese did not know electricity, but they knew magnets : probably they found – as did the Greeks magnetite mines (a magnetic iron oxyde). But the Chinese also discovered the earth's magnetism and invented the compass, 1000 years B.C., later transmitted to the Occident where the science of electricity and magnetism was born many centuries later, in France, Italy and Great-Britain. The high point of this discovery was the Maxwell equations, one of the greatest scientific events in the history of science : beside the empty world inherited from Democritus, filled with material points obeying Newton's laws