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## Jungle Gym

Jungle Gyms were invented to enable children to achieve an intuitive understanding of the Cartesian coordinate system.

## Feynman Point

The Feynman point is the sequence of six 9s which begins at the 762nd decimal place of the base 10 representation of π. It is named after physicist Richard Feynman, who once stated during a lecture he would like to memorize the digits of π until that point, so he could recite them and quip “nine nine nine nine nine nine and so on.”