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Einstein as a speed devil - science puzzle
| How fast should you drive towards a red traffic light to see it appear as green? |
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Rocket launch - science puzzle
| 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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Sky theory - science puzzle
| Why has the sky most often a blue color? And for what reason becomes the sky becomes suddenly reddish when the sun sets? Why does this red color only appear during a sunset or sunrise and not when it is noon? |
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