What's the difference between a parallel, series, and plug-in hybrid, and why do you need to know? Everything about the technology and the vehicles for the shopper or the merely curious.

If diesel engines need air for combustion, then how can submarines use them? Here's what you need to know about the clever engineering behind diesel subs.

Diesel engines do their hardest work in the toughest jobs, from highway semis to construction equipment, and the reason they can survive that punishment starts with how fiercely they squeeze the air ...