In 1673, Christian Huygens invented the first engine. It was designed to pump water from the Seine River to King Louis XIV's Palace of Versailles. Built with an open combustion chamber, it consumed ...

Today's new family of GE GenX engines for Boeing's new 787and 747-8 produce upward of 70,000 pounds of thrust compared to the 5,000 pounds for the early jet power plants. Ever wonder how that happens?

Are all product recommendation engines the same? originally appeared on Quora: the place to gain and share knowledge, empowering people to learn from others and better understand the world. Answer by ...