“Cell-phone ­batteries that last for a monthbetween charges."—Jason Kilar, CEO, Hulu

“An electric energy-storage device to power our cars and homes from handheld ­devices that could be charged from renewable resources.”—Jon Wellinghoff, commissioner, Federal Energy Regulatory Commission

“Payment via cell phones.”—Marissa Mayer, vice president of search products and user experience, Google.

“Meters that know whether a car is parked at them and garages that network their capacity and rates. Drivers could then specify where they want to park and how far they’re willing to walk and reserve the cheapest space.”—Richard Bookstaber, author; financial risk manager.

“A Google-like image-search engine.”—John Yemma, editor, Christian Science Monitor.