They started out like any kids, full of hope and dreams - but now they're homeless and in terrible danger of slipping between the cracks. These kids are not living under a bridge, but under the radar -- part of a new under-reported type of homelessness -- surfing from couch to couch, from the beds of friends to the beds of strangers. For over a year, Chris Cuomo and his team have chronicled the terrors and triumphs of four such teenagers, all surviving largely on their own.

Lisa Nowak has been to outer space, but that's nothing compared to the trip she took from Houston to Orlando. It was a bizarre story that made national headlines: decorated astronaut and national hero Lisa Nowak drove 900 miles through five states to confront her ex's new girlfriend, Air Force Captain Colleen Shipman, in a deserted dark Orlando airport parking lot. Why did Nowak have a knife, bb gun, mallet, pepper spray and diapers with her? What was her plan?