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Mental maths: exercise for your brain

This article was published in the 17-Apr-2014 issue of Finweek Magazine

Do you hit a mental wall when calculating numbers in your head? You’re not alone. 1,363 more words


Lines and spheres

What code goes into the question mark?


A prime maze

Mazes are very old and very diverse. I hope to write about mazes in eneral another time, but here is one variation.

Go from 1 the upper left corner to the bottom right corner with the following rules: 169 more words


Poetry test: Bot or Not?

Take the poetry test

Do you think you can tell the difference if a poem is written by a human or a robot? I just learned about this website in the… 26 more words


Color grid (1)

What number goes into the cell with the question mark?

1) Color grid*

You can check your solution at here

Please try to solve the puzzles on your own: your self confidence will grow. 99 more words