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Vandaag is het 16 October 2018

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# Painting stairs - math puzzle

Difficulty:

Rating: 2.4/5.0

 To enter the house of the professor, you first have to walk up a stairs which consists out of twenty steps. The professor thinks his stairs are boring so he decides to paint them. He buys two colors, yellow and green. Every step will be either painted yellow or green and moreover the professor does not want to have two yellow steps directly after each other. In how many ways can the professor paint his stairs? And what is the name of the professor?

# Sky theory - science puzzle

Difficulty:

Rating: 3.4/5.0

 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?

# Know what you want - puzzling puzzle

Difficulty:

Rating: 2.7/5.0