Not for you, fatso. For the World Food Program.
http://www.freerice.com
20 grains of rice donated per correct answer. I was able to keep my score (they call it "vocab level") consistently around 40.
You, of course, have no chance of surpassing one such as I. However, it would amuse me to see you try.
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I was gonna send a robot back in time, but I got high.