by How It Works Team · 07/11/2012
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Why do trees produce sap?
Will we use hyperloops to commute in the future?
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’?
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