Mr Duffy called for proposals from commercial companies to build a reactor that could generate at least 100 kilowatts of power.
Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00530-y
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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.