Elon Musk has been the target of a relentless smear campaign this year. While greedy (and shadowy) figures spew salacious gossip, diehard Tesla fanboys claim to know the real deal — right down to the most obscure detail about The Ironman. Hint: see item #5 below. To test your own knowledge, see if you’re aware of these surprising 15 factoids (via CNBC and Redbook) about Elon Musk.

1. Musk holds South African, Canadian, and U.S. citizenship.

Musk was raised in Pretoria, South Africa, before moving to Canada at age 17. Three years later, he moved to the United States to study business and physics at the University of Pennsylvania in Philadelphia.

2. Musk has a net worth of $21.8 billion.

All that work at Tesla, SpaceX, and PayPal has really paid off for Musk. He’s currently the 37th-richest person in the world, according to Forbes.

3. Musk taught himself computer programming at the age of 9.

He reportedly taught himself the basics of computer programming when he was only 9 years old. Three years later, Musk built a space-themed PC game called Blastar. He sold the code for Blastar for $500 to a computer magazine. You can actually still play Blastar online.

4. Musk dropped out of Stanford after just two days.

After earning two bachelors’ degrees (yes, two) at the University of Pennsylvania, he moved to California to study Physics at Stanford. But after just two days, he dropped out to found his first company, Zip2 Corporation.

5. Musk was the inspiration for Tony Stark, a.k.a. Ironman.

The superhero/serial entrepreneur Tony Stark a.k.a Ironman is based at least a little bit on Musk. The actor who plays him, Robert Downey Jr., reportedly wanted to sit down with Musk to get inspiration for the character. Parts of Iron Man 2 were even filmed at SpaceX and Musk made a cameo appearance in the movie.

6. Musk’s official Tesla salary is way lower than you think.

Musk’s total compensation package for Tesla is less than $40,000, and he reportedly doesn’t even cash the checks. However, between the 35 million Tesla shares he owns, and his earnings from SpaceX and he’s doing alright (see item #2).

7. Musk is the owner of a “submarine car” from a James Bond film.

Musk is the owner of the “Wet Nellie,” a Lotus submarine car prop from the 1970s James Bond movie The Spy Who Loved Me. He reportedly plans to to convert it into a real car that transforms into a sub.

8. Musk is a big X-Men fan.

During a Tesla factory upgrade, Musk decided to name some of the factory’s new robots after X-Men characters, including Xavier, Iceman, Wolverine, Storm, and Colossus. When announcing the factory upgrade, Tesla wrote, “To us, these robots are like superheroes, so we figured they deserved superhero names.”

9. Musk ran a nightclub out of his house in college.

When he was attending the University of Pennsylvania, Musk and his roommate decided to escape student housing and live in a bigger house off-campus. In order to pay the rent, they turned it into a nightclub that attracted as many as 1,000 patrons per night.

10. Musk started building his own rockets when he was a kid.

A housekeeper would take care of Musk and his siblings when his parents were away. “She wasn’t, like, watching me. I was off making explosives and reading books and building rockets and doing things that could have gotten me killed,” said Musk. “I’m shocked that I have all my fingers.”

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