A wireless transmitter uses almost no power and at first glance appears to violate the laws of physics. It’s actually a clever use of physics that could one day transmit data from tiny remote sensors.

Every few centuries the sun blasts the Earth with a huge amount of high-energy particles. If it were to happen today, it would wreak havoc on technology.

The ubiquity of mobile phones is a defining feature of the 21st century, but it's been possible to place a phone call on the go since shortly after World War II.

An electrical engineer explains how smoke detectors work, and how to reduce the chances of a false positive.

There are 15 different kinds of electrical outlets around the world. One standard would be more convenient, but no one wants to change theirs.

Sensors are everywhere, from your phone to your medicine cabinet. Here's how they turn events in the physical world into words and numbers.