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Magnetic fields are invisible. You can’t see them, but you can see what they do, like attract a paper clip or push another magnet away. But wouldn’t it be cool if we could find out how to show the dir ...
A lot of things can act like magnets—they just need an electric charge. If we give a comb an electric charge, can it separate pepper from salt? Let’s find out!Can a comb separate salt and pepper?It is ...