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Photoreceptor distribution in the fovea
Oct 10, 2013
Khan AcademyRonald Sahyouni
We’re excited to announce that studying for the SAT for 20 hours on Khan Academy’s free Official SAT Practice is associated with an average score gain of 115 points. That’s nearly double the average score gain compared to students who don’t use our free test prep. Start studying today! http://khan.co/SATStudyonKA | Khan Academy
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48K views · 1.6K reactions | Jason spent 15 years in prison. While there, he started learning math from transcripts of Khan Academy videos that his mom printed for him. He now studies computer science at Stanford. | Khan Academy | Facebook
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