It might seem that the future is running a little behind schedule. But never fear! It is, indeed, only a matter of time.
So today, allow us to present to you eight technologies that were supposed to be up and running by now, but still haven’t become part of daily life; along with info on when we can expect the technologies to actually arrive. From fusion to artificial intelligence, from flying cars to jetpacks, these are our favorites of science's delayed (but never destroyed) promises.
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.