About 600 B.C.E., Greek scientist Thales observed that when amber is rubbed with cloth, it acquires the ability to attract feathers or small pieces of straw.
Sekitar tahun 600 SM, ilmuwan Yunani Thales mengamati bahwa kalau batu ambar digosok dengan kain, batu itu bisa menarik bulu - bulu atau potongan - potongan kecil jerami.