This site donates 10 grains of rice for every question you answer
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Home | Freerice
https://www.freerice.com/
https://www.freerice.com/
A serving of rice is at least 5000 grains.
The site is a good thought, but there are much more effective ways to spend your time if you want to make the world a better place.
we used to use this website in elementary school to practice for math n such. great for kids!