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FreeRice.com, a UN World Food Programme quiz site that donates 10 grains of rice per correct answer to fight world hunger.
social_civic
The United Nations World Food Programme’s FreeRice.com donates 10 grains of rice for every correct answer on its online quiz, depending on brain cycles from the Fogg model (users don’t find it difficult to answer the quiz questions once they are on the website, and are more likely to donate).