1. Ann Makosinski, 16, Thermoelectric Flashlight
2. Jack Andraka, 16, Inexpensive Cancer Detection
3. Eric Jacqmain, 19, Solar "Death Ray"
4. Andrew Brackin, 19, Parking App
5. Nick D'Aloisio, 15, Summly
6. Elif Bilgin, 16, Banana Bioplastic
7. Jen Lamere, 17, Twivo
Lamere's app acts as a pause button for TV spoilers. Tweets pertaining to a live event can be delayed, and they'll show up at the top of the tweet stream after the event has concluded.