Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00674-x
Each puzzle features 16 words and each grouping of words is split into four categories. These sets could comprise of anything from book titles, software, country names, etc. Even though multiple words will seem like they fit together, there's only one correct answer.
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In addition to being cleaner for the environment, he said it could be "cheaper to get rid of that waste through an anaerobic digestion plant" than other methods.