Take a long look at those semis, tractor-trailers, and 18-wheelers ... their wheels. Have you ever wondered what those do? Well, the answer may be less interesting than you expect. Semi-truck ...

An curved arrow pointing right. Elon Musk unveiled the Tesla Semi, the company's first electric 18-wheeler. The truck is capable of going from 0-60 mph in five seconds, and has a range of 500 ...