University of Washington created a wireless communication system that allows devices to interact by harvesting power from the environment.. See the complete paper here: http://www.theengineer.co.uk/Journals/2013/08/14/u/g/g/comm153-liu.pdf Using so-called ambient backscatter, these devices can reportedly interact with users and communicate with each other without using batteries because they exchange information by reflecting or absorbing pre-existing radio signals from TV…