This is just a quick plug – again for the site  you answer questions and for each right answer you ‘earn’ 20 grains of rice which is then distributed through the UN to hungry people. Recently they added a load more categories like identifying the country on the map; chemical symbols and famous paintings. It is fun, you will learn loads so helping your little grey cells and the best bit is that you will be helping others at the same time. It is addictive as you want to get the question right and see your rice bowl filling up. Check it out. pax