The U.S. population has been growing at an ever-increasing rate: in 1900, the population was 76 million people, by 1950 it had grown to 152 million, and by 2015 320 million people called the U.S. home ...

Hydrogen fuel cell technology has plenty of potential as a green source of energy, but it's yet to find a way into the mainstream. There are only a handful of hydrogen-powered cars on sale today, and ...