Improve your English vocabulary and help end world hunger simultaneously! As someone who enjoys reading the dictionary and is also sensitive to global issues, I absolutely adore FreeRice.com. The site uses a custom database with thousands of words ranging from beginner's level to advanced. Users play a definition-matching game that adjusts in real time to their performance, ensuring that it's challenging without becoming too frustrating. And here's the truly great part: for each word you get right, the site (a sister site to Poverty.com) donates 20 grains of rice through the United Nations World Food Program to help end hunger.

In just five minutes, I managed to help donate 1120 grains of rice - plus I learned several new words! So far, over 25 billion grains of rice have been donated. Head on over to make your contribution and smarten yourself up!