A group of University of Washington researchers showed a year ago that brain-to-brain interfacing is possible in real life. Now, they're back after conducting a more thorough experiment, proving that their initial success wasn't a fluke. This time, the team performed tests using not just one pair, but six people divided into three pairs: one receiver and one transmitter. Just like before, the transmitters are hooked to an EEG machine (above) that can read brain waves, while sitting in front of a computer game. They need to defend a city in the game by firing cannons, but they cannot interact with it directly -- they can only transmit thoughts via the internet to their partners seated somewhere across the campus.