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Puzzles, situation puzzles and recreational mathematics.

situation puzzles and recreational mathematics. Neuron juice
 
 
 

Neuron juice.

The important thing is not to stop questioning. (Albert Einstein.)

  

 

or young witch young witch .

 

Ilusion óptica

This is one of the best known and widely used optical illusions.

 

What do you see in the picture a witch or a girl ?