The idea behind the Epiphany onE Puck is to use a stirling engine powered solely by heat disparities, such as a hot or cold drink, a candle, ice, etc. These heat sources will provide enough power to the stirling engine to fully charge your cell phone battery.
A company called SceneTap is putting facial recognition software to good use: analyzing the age and gender ratio of bars and clubs, and reporting the data to you through a phone app. It doesn't recognize individual faces or store data, but it will give a ballpark estimate on how many ladies/fellas are around and their approximate age. There are 50 locations in the Chicago area using SceneTap right now, and they have plans to expand.