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Which Twin Is Older?

A simplified account of special relativity and the twins paradox.

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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?

Stonehenge

Age 16 to 18 Challenge Level:

Why do this problem?
To gain a better understanding of relative velocity in a very simple case.

Possible approach
A good topic for class discussion.