Stock Photo - middle-aged woman trying to build a pyramid from different pieces with globes tricky play for the intelligence problem in the museum Mathematikum in the town Giessen Gie¯en Germany Hesse question sign in the background. - 01/01/2007

Stock Photo: middle-aged woman trying to build a pyramid from different pieces with globes tricky play for the intelligence problem in the museum Mathematikum in the town.

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