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Sources:http://science.howstuffworks.com/electromagnet.htm http://ffden-2.phys.uaf.edu/113.web.stuff/travis/what_is.html ...
53,090 views
8 years ago
Earth and Compasses Perhaps you've played with bar magnets or have a magnet on your fridge. But did you know that the earth ...
263,497 views
4 years ago