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dewey1 writes "FreeRice http://www.freerice.com/ has a custom database containing thousands of words at varying degrees of difficulty. There are words appropriate for people just learning English and words that will challenge the most scholarly professors. In between are thousands of words for students, business people, homemakers, doctors, truck drivers, retired people... everyone! For every correct selection FreeRice donates 20 granis of rice through the United Nations to world hunger organizations — financed by the advertisers on the site."