by How It Works Team · 02/07/2012
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What is used to colour stained-glass windows?
Could vaccinations have stopped the spread of plague in medieval times?
Why weren’t ships made of metal sooner?
Have we discovered all the land on Earth?
What in a snake’s venom makes it poisonous?
Can you injure yourself by stretching?
What would happen if I fell into the centre of the Earth?
What are saturn’s rings made of?
Why do our eyes close when we sneeze?
What are ‘the bends’?
How were books printed before computers?
How did the first phone call work?
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