What if cracked roads could heal themselves? What if pipes could be installed without digging trenches? Sure, it sounds crazy, but who ever expected you'd be able to log on to the Internet from your phone when those clunky models were all the rage in the 1980s? We haven't seen flying cars hit the mass market yet, but we could see underground power lines that heal themselves, among many innovations, in the next decade or so. Sure, you'll have to wait a while for some of these ideas, but are they worth it?
Which of these ideas do you see as the most viable? Which of them do you wish you had right now?