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Andrew Zhang 张灿诚

Recent activity by Andrew Zhang 张灿诚

Flag REQUEST
1. Community
2. Content Requests and Feedback
May we please say that people should not be able to post silly 'questions' to the discussion section of a course? All you see are questions or 'nonquestions' that have nothing to do with the topic ...
Black Hole Badges
1. Community
2. General Khan Academy Questions
I can guess what the Black Hole Badges are (2 of them). All of the badges that have energy points as reward are for mastering a number of unique skills. Two of the Black Hole Badges have a lot of ...