Thread:HMcCoy/@comment-28838092-20140708164421/@comment-24808864-20140708193822

If you write "current and retired" then you have opened it up to badges from the past, which I am unaware of how to find.

In fact, searching the KA API for "badge_category": 4 (which is the code for Black Hole Badges) only seems to yield three returns (namely Tesla, Artemis and Atlas).

I do know there are other Black Hole Badges that are specially awarded (like Is Sal) and some that may have been Black Hole at one time then demoted.

I guess I would answer five because I could justify that by showing the three that are obviously in the badges section (Atlas, Artemis, and Tesla) and I could link to Sal's page (https://www.khanacademy.org/profile/sal/) to show two more "Galileo" and "Is Sal."

I think you might see a bit of argument, so you might have to accept alternative answers if they can provide direct evidence for the answer they think should be true.

Or you can avoid the debate, and just say the answer is F. Use the justification that "It changes over time, so there is no fixed number of black hole badges." But this would be kind of cheap!