This is a fascinating subject. While technological progress seems certain, the direction of that progress will be surprising. We have iPads, but not flying car

This is a fascinating subject. While technological progress seems certain, the direction of that progress will be surprising. We have iPads, but not flying cars. We have Facebook, but no moon bases. No one would have expected that fifty years ago. And I'm not saying I'd rather have a flying car than an iPad, but building things "people want" will probably lead to an unexpected world.