# Or macOS Keychain
Source: Computational Materials Science, Volume 267
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The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
Despite living in the US for a number of years, Rhys previously said he he tried to keep his family connected to Welsh culture through sharing traditions with his wife and children and trying to speak to his son "only in Welsh".