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Brain Dump

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  What is used to colour stained-glass windows?

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  Could vaccinations have stopped the spread of plague in medieval times?

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  Why weren’t ships made of metal sooner?

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  Have we discovered all the land on Earth?

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  What in a snake’s venom makes it poisonous?

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  Can you injure yourself by stretching?

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  What would happen if I fell into the centre of the Earth?

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  What are saturn’s rings made of?

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  Why do our eyes close when we sneeze?

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  What are ‘the bends’?

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  How were books printed before computers?

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  How did the first phone call work?