Scientists have found a way to make GPS remarkably accurate in city “urban canyons,” where navigation has long gone wrong. Most of us trust that the location shown by our GPS is accurate. But anyone who has tried navigating an unfamiliar city knows that is not always the case. You may be walking steadily down [...]

A mysterious low-frequency sound known as The Hum has been reported around the world for decades, leaving researchers searching for its source. Imagine lying in bed late at night and hearing a faint engine-like drone that seems to come from somewhere outside. You check the windows, listen for traffic, and search for a nearby machine. [...]