Six Tech Start-Ups That Could Change The Way We Live   By: John Brandon - Nov. 9, 2010         From indoor GPS for emergency workers to a human-powered tractor for the third world, the unusual products these six tech start-ups are working on could change the way we work, play and even wake up.

In the technology world, just because you have a new idea does not mean it will translate to a real company that can produce revenue. These companies have started with a germ of an idea – say, teaching you guitar or helping employees communicate about projects – and created a company that intends to grow quickly and become a major success. We tapped each one to find out how the product works and how the founders plan to keep the start-up momentum going.