Free rice, and free knowledge
FreeRice is an excellent website that combines education and charity. The concept is simple: answer a question correctly and the UN World Food Program will donate 10 grains of rice to a hungry family somewhere in the world.
FreeRice started out as an English vocabulary game. They would show you a word and then give four possible definitions or synonyms. Since then, they have added English grammar, French, Italian, German, Spanish, and several other subject areas like mathematics, chemistry, and geography.
The difficulty level automatically adjusts depending on whether you get the question right or wrong, so the more questions you get right, the harder it becomes. A great feature is that it will tell you the correct answers to the questions you miss, and repeats them later on in the game – an excellent revision method.
The highest English vocabulary level they use is 60. I’ve gotten to a maximum of 50 the last few times I’ve played. The most memorable word I’ve learned today is jalousie, which is a type of window blind. I actually guessed the answer correctly, even though it looks like a terrible attempt at spelling ‘jealousy’.
There’s no minimum or maximum number of questions, so there’s no excuse for having no time to feed people in need. See if you can get to the highest level in your area of expertise, or even better, in the language you’re studying.
They say that nothing is free, but the cost of this is hardly worth mentioning, and the benefits far outweigh the effort of pointing and clicking!