This document discusses the science behind various common superstitions. It explains that while superstitions are beliefs about good or bad luck, science provides rational explanations. For example, throwing coins in water was thought to bring good luck, but copper coins contained a nutrient humans needed. Sleeping with one's head north was believed to invite ghosts, but is really due to differences between human and Earth's magnetic fields. Temple locations take advantage of places with high magnetic and electric wave activity. Solar eclipses were feared due to "bad rays", but really occur due to the moon's shadow. Overall, the document uses science to explain the reasoning behind popular superstitions.