Of the 250,000 Americans who die of cardiac arrest each year, 70 percent of them do so at home, where there's no access to a lifesaving defibrillator.
Enter the WCD 2000, the world's first wearable defibrillator. Electrodes in the chest-belt monitor the heart; if they lose the heartbeat, they signal the waist-mounted defibrillator to send a shock. Meanwhile, tiny capsules release an electricity-conducting gel onto the chest.
The first patients will likely be those who are temporarily at high risk for heart attacks, or people who don't qualify for an implantable defibrillator.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.