Modern life runs on wireless technology. What if the energy powering our devices could also be transmitted without wires? This week we are revisiting a talk by electrical engineer Ali Hajimiri, where he explains the principles behind wireless energy transfer and shares his far-out vision for launching flexible solar panels into space in order to collect sunlight, convert it to electrical power and then beam it down to Earth. Learn how this technology could power everything — and light up our world from space.