'Smart Shoe' Devices Could Charge Up as You Walk

The next generation of wearables could be powered by an unlikely energy source: you. Two new devices that fit inside the sole of your shoe can harvest energy from your movements as you walk or run, and then use that energy to power sensors and other electronics.

These devices could one day be used to create wearables that never need to be plugged into a charger, according to the researchers in Germany who developed them.