Great site that I saw advertised by the BBC technology program "Click", here......
http://www.freerice.com where you can donate grains of rice through the UN World Food program by answering quiz questions (10 grains per correct answer). Easy questions- eg define a word from 4 possible choices (usually with 3 obviously wrong definitions), or choose art, geography, maths questions.
You dont have to sign up to donate/play unless you want a user name or to start a group.
Go on..... it is Christmas. Give someone a present of food at no cost to yourself.
Warning; it can get addictive to see how many grains you can donate, lol!