About 2,000 years ago, Wang Chong, a Chinese philosopher, discovered that it one rubbed a piece of amber with a piece of fur or wood, he could always produce electricity.

• 大约2，000年前，中国的一位哲学家王充发现，如果把一块琥珀在一块兽皮上或木头上摩擦，随时都能产生电。