You have an exceptionally fast brain with an IQ of 140+ if you can solve this math puzzle in just 7 seconds. Put your brain ...

THIS publication consists of a series of twenty-four graduated test papers selected chiefly from the annual examination questions in the elementary stage of geometry of the Science and Art Department.

The Mundurucu tribe are an isolated group living deep within the Amazon rainforest. Their language doesn’t have exact terms for numbers or words for most geometric shapes…and yet they outperformed ...