We spend a third of our days asleep, and a good portion of the rest of them talking about it. We had a good night's sleep, a bad night's sleep, we stayed up too late, got up too early, now we're exhausted, last night we wrote a perfectly coherent essay in our sleep... well, maybe not. But Dr. John D. Quackenbos did, or so says a Popular Science article from 1919.
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.