Inside the power source for portable electronics and electric vehicles.
A desktop 3-D printer builds plastic objects layer by layer
A toy ball moves under the command of a smart-phone application.
A globe studded with cameras captures a panorama if you throw it in the air.
Belts of electrodes can control muscles in the forearm to help a beginner play a musical instrument.
An engineer has rigged up several devices that enable a touch interface to respond to nuances such as pressure.
Microsoft's Kinect provides a cheap way for robots to interact with their surroundings.
Google's self-driving car.
How a cheap microcontroller is making it possible for anyone to design and build hardware.
Researchers "break in" with software and a laptop.