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science
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Day away
Sarah and Mike conclude that it is wednesday. But five minutes later it is already friday. How is that possible?
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Einstein as a speed devil
How fast should you drive towards a red traffic light to see it appear as green?
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Rocket launch
Why are the European Ariane rockets launched from the Korou site in French-Guyana, South-America, and not simply from some place in Europe where the rockets are partly built?
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