Tesla

Tesla is a black hole badge and the hardest (of the currently possible badges) badge to achieve. To earn it, you need to earn 10,000,000 energy points.

Because you earn this badge by accumulating points, you don't receive additional energy points for this badge.

It is getting easier to get this badge each day as new skills and videos are being added.

Until now, only a few users have earned this badge.

Name
This badge was named after Nikola Tesla - a Serbian inventor, electrical engineer, mechanical engineer, physicist, and futurist. He has also worked with Thomas Edison though is most famous for creating alternating current (AC) which pitted him against Thomas Edison and his direct current (DC).

Trivia

 * This is one of the five black hole badges. It does not give the user any energy points when they obtain it.
 * This is one of the many badges you can earn on Khan Academy.