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Question:

Imagine that we sprinkle some salt on a piece of white paper. Then we sprinkle some pepper over the salt. Now, using only a plastic comb, how would you separate the salt from the pepper?

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Solution: Pull the comb through your hair several times. This will create static electricity and attach a negative charge to the comb. Now wave the comb over the salt-pepper combination and the pepper, being much lighter, will attach itself to the comb. The salt crystals, being much heavier, will be left behind.

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