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I know I've mastered over 500 skills, but it's been years since I've known the exact number. It would be interesting to see exactly how many you've mastered. My estimate is around 1000, but I have ...

1. Comunidade
2. General Khan Academy Questions
3. how can you see how many skills you have mastered

There are 6 known black hole badges. Tesla, Is Sal, Galileo, Atlas, Artemis, and Herculean. Is Sal is only achievable by Sal Khan. Tesla requires 10,000,000 energy points to obtain. Galileo require...

1. Comunidade
2. General Khan Academy Questions
3. How to Get the Badges in Khan Academy

I dislike the changes too but it is for the best. They had to remove the badges to clear up space for future updates.

1. Comunidade
2. Technical Issues and Workarounds
3. 50 badges showing as retired.