How did Elon Musk get two degrees (physics and economics)?

I read this in his biography by Ashlee vance. It also says that he got an especialization in materials physics. Did he do one career after another? Please explain, this question comes from genuine curiosity.

Submitted February 08, 2021 at 08:44PM by Siderius_Nuncius https://ift.tt/3aLXGqS