Sources & Licenses
Primary data sources
Statistics on this site come from official U.S. sources, primarily the USDA National Agricultural Statistics Service (Quick Stats). Each quiz page cites its exact source, data vintage, and how to verify the number.
License of the data
Works of the U.S. federal government are in the public domain (17 U.S.C. §105). We reproduce published estimates without modification; derived values (such as “#1 is X times #2”) are computed from published values and verified by automated tests.
Puzzles
Logic puzzles are generated from rules by this site (no external data). Answers are mechanically verified to follow each rule.
This site
Built as an independent project by the maker of Japan in Numbers (suuji-nippon.jp).