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Stonehenge

Age 16 to 18
Challenge Level Yellow star
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Consider the movement of the stone relative to the logs and of the logs relative to the ground.

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Which Twin Is Older?

A simplified account of special relativity and the twins paradox.

Take a Message Soldier

A messenger runs from the rear to the head of a marching column and back. When he gets back, the rear is where the head was when he set off. What is the ratio of his speed to that of the column?

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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