Researchers have built a device resembling a knee brace that can generate usable amounts of electrical energy as a person walks. The brace, described in an article in the journal Science, harvests the energy lost when a human brakes the knee after swinging the leg forward to take a step. Last year, scientists created a backpack frame that translated the up-and-down motion of a frame mounted backpack to electrical energy. Other researchers are studying ways to harvest energy from footsteps by means of piezoelectric devices mounted i the soles of shoes. In this segment, Ira talks to one of the creators of the new knee-mounted device about harvesting energy from human movement.
Produced by Karin Vergoth