Ok, so far, I've loved Khan academy. It's probably the greatest free learning website, and honestly in my opinion it's better than the other paid ones like IXL. But, Khan does have some flaws. For one thing, when someone posts a comment, it takes a lot of time for it to show up, or doesn't show up at all. I don't know if it's just me, but if it isn't please fix this. Also, I've checked in the khan academy wiki and i've seen so many retired badges that I woud've loved to get, like Millionare. Also, I don't understand about the "hidden" black hole badges that don't show up but you can still earn them??? Also, I've been earning badges and energy points honestly, and there are some people who barly come on here and still somehow have all the black hole badges. That just makes me feel that my work is just in vain. Also, some of the content in history just doesn't cover some things at all. For example, in world history, they say that the main reason that the Sui dynasty fell was because of the "great Canal builds and raised taxes" and that is right, but the decisive factor was the two failed attempt of the Sui to invaide the Kingdom of Goguryeo, where they suffered a humiliating defeat. Although Khan Academy is already good, with changes it could become even better. Please at least consider this, please and thank you. P.S: please bring back the badges.