While we wait for Google I/O (which starts on Wednesday) to find out what will become of the company's TV platform, a team that we've seen bust open the padlocks on Google TV, Chromecast and Roku has a new target. GTVHacker just revealed an exploit for the (now Google-owned, and owner of Dropcam) Nest Learning Thermostat. It could let owners do new and interesting things (like replace the Nest software entirely) but of course, someone with bad intentions could take it in another direction: monitor whether the owner is home via its motion detector, sniff network traffic, or just crank up the temperature a few degrees -- all without even opening the device. Interested in how the hack works? Like most jailbreaking techniques we've seen on mobile and home connected platforms it requires physical access to the device, so you don't have to worry bout someone wardriving down the block and wreaking havoc with your A/C.