People who believe they contribute to society are more likely to vote and engage in politics. They were also more likely to donate to and volunteer for political causes compared to individuals who saw their contribution to society as smaller.

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Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.

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