Abraham Lincoln proclaimed Thanksgiving a national holiday in 1863, urging Americans to pray
"to heal the wounds of the nation and to restore it ... to the full enjoyment of peace, harmony, tranquillity, and union."
Learn more about the largest secular holiday in the U.S., its traditions, and its historical roots.
A large collection of informational and educational videos from animals and landmarks to language arts and history.
A vast compendium of statistics and up-to-date facts and figures, on everything you need to know.
An unabridged dictionary from aalii to zymurgy, including a pronunciation guide.
An atlas featuring maps and detailed profiles of all 193 countries and the 50 U.S. states.
A current and comprehensive encyclopedia covering all the major branches of knowledge from astrophysics to Zimbabwe.