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Day away - science puzzle
Sarah and Mike conclude that it is wednesday. But five minutes later it is already friday. How is that possible?
Pole vaulting - science puzzle
| What is the maximal height a pole vaulter could theoretically jump? Would it ever be possible that a pole vaulter passes the height of 10 meter? |
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Boat and stone - science puzzle
Suppose you sit in a rubber boat in a swimming pool. In the boat lies a stone. You throw this stone from the boat into the pool. Will the water level in the pool raise or drop?
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