Wikipedia
MathPath
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MathPath is a mathematics enrichment summer program for students ages 11–14 (middle school age in the US). It is four weeks long, and moves to a different location each year. MathPath is visited by world-renowned mathematicians such as John H. Conway and Francis Su. It was probably the original, and is still one of the few, international residential high-end summer camps exclusively for mathematics and exclusively for students of middle school age.