The upside of Wi-Fi is that it's everywhere - invisibly connecting laptops to printers, allowing smartphones to make calls or stream movies without cell service, and letting online gamers battle it out.
The downside is that using Wi-Fi consumes a significant amount of energy, draining the batteries on all those connected devices.
Now, a team of University of Washington computer scientists and electrical engineers has demonstrated that it's possible to generate Wi-Fi transmissions using 10,000 times less power than conventional methods.