We test plenty of cars here at PopSci, but it's not everyday we get to try one as forward-looking and promising at the Equinox. The car runs on hydrogen fuel cells; turn the ignition and the car instantly (and silently) churns out  enough electricity  to power six houses. So how does that much raw, green power feel? Check it out as senior associate editor Sean Captain takes the Equinox on a spin up the Vegas Strip.