High-risk patients can lose hours and thousands of dollars to in-hospital heart monitoring, but now physicians can regularly check in from afar. German cellphone maker H’andy’s Sana 210 needs only 30 seconds to measure heart rhythm and send it to a doctor. When your heart moves, it sends electricity through your body; the Sana uses the same electric sensors as a hospital electrocardiogram (ECG) to record those pulses through your fingertips.
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.