Just curious! What do you have to do to earn the Black Hole badges? I know they are supposed to be a secret, but it makes me want to know even more! :) And also, has anyone ever got any of them or all of them?
And, what happened to the one that I know about, where you have to be Sal Khan to get it? Did they take it off?
Any answers or comments are appreciated! I read all of them though I might not respond, this comment chain is getting really long! >.<