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Library of Congress, the de facto national library of the United States and the largest library in the world. Its collection was growing at a rate of about two million items per year; it reached more than 170 million items in 2020. The Library of Congress serves members, committees, and staff of

Leonardo da Vinci was an Italian painter, draftsman, sculptor, architect, and engineer whose skill and intelligence, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal. His Last Supper (1495–98) and Mona Lisa (c. 1503–19) are among the most widely popular and