One critical challenge for engineers is to measure distances with ever greater accuracy. In recent years, this has become possible with nanometer resolution over distances of a few meters. That means ...

"Pokémon Go" has thrown in American players' faces what the rest of the world has long known: Our systems of measure make no sense, almost no one else uses them, and we should probably go metric.

Converting between kilometers and miles becomes effortless with these mental math tricks. Learn to quickly estimate distances for everyday scenarios, from understanding international content to ...