JOJFUN

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What is black when you buy it, red when you use it and gray when you throw it away?

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What element is derived from a Norse god?

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What element is a girl’s future best friend?

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When the son of the water returns to the parent, it dies. What is it?

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Which is heavier, a pound of bricks or a pound of feathers?

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What did the angry electron say when it was repelled?

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What did the scientist say when he found 2 atoms of helium?

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What do you do with a dead chemist?

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What is the center of gravity?

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What can eat a lot of iron without getting sick?