Tesla Motors has outsold several luxury carmakers in California in 2013, on the strength of its Model S, seen here in the foreground. The Telsa Roadster is behind it. James Lipman/Telsa hide caption

toggle caption James Lipman/Telsa

Elon Musk's "Hyperloop" vehicle. Elon Musk hide caption

toggle caption Elon Musk

A Tesla Model S drives outside the Tesla factory in Fremont, Calif., on June 22. The electric car was named Automobile of the Year by Automobile Magazine and Car of the Year by Motor Trend. Paul Sakuma/AP hide caption

toggle caption Paul Sakuma/AP

NPR thanks our sponsors

Become an NPR sponsor