"Gravity is caused by the fact that the earth spins." I heard that from a few people when I was really little. I remember imagining a story in which Superman (or some other superhero, I'm not sure) pushed the earth so that it spun too fast and made us all so heavy we couldn't stand up. Then he stopped the earth and we all started to float. "Gravity is caused by air pressure pushing us down against the earth." My sister heard that one from an elementary school teacher. Fortunately, my sister was smart enough to immediately recognize that it was nonsense. "Seasons are caused by the fact that the earth's orbit is elliptical. When the earth is closer to the sun we have summer, and when it is farther away we have winter." That one was in one of my elementary school textbooks. I kid you not. What are some that you heard?