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Before Copernicus, everybody thought the sun revolved around the earth; it took a while (and several inquisitions) to catch on, but nowadays most people know better. Here are a couple of persistent scientific myths. Or maybe not. Which are true? 1. Water swirls down the drain the other way in Australia. 2. You can catch a bird if you put salt on its tail. 3. You can't stare too long at the sun. 4. There is no such fish as a sardine. 5. Hair and fingernails keep growing after death. 6. Mixing milk and meat is dangerous. 7. Owls see perfectly well during the day. 8. It's okay to mix alcoholic drinks. 9. When you freeze food, it kills the bacteria