You may have already discovered FreeRice.com—the addictive online game that donates 20 grains of rice to the World Food Programme for every word you define correctly. In May, a similar site for children—OneHen.org— was launched. Visitors to OneHen win beads while playing the four games on the Web site. Players can then donate the beads, and by doing so help make a daily $100 loan to an African entrepreneur. (The beads have no specific value; even if only one child has donated one bead by...


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