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Sign-up to be a contributor to expii.com, a database with a wealth of problems, lessons, and concepts created by Professor Po-Shen Loh, the world-renowned coach of the USA International Mathematical Olympiad team.
With "explanations that speak to you" and "personalized practice", expii.com is ideal for exploring and learning concepts in fields all over mathematics and science. 
We highly recommend creating an account on this website for learning opportunities. Expii.com is also looking for contributors to help permanently add to this database of knowledge!
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