The New Scientist reported on a headset that can read people’s brainwaves. It is powered by thermoelectrics and solar panels and can transmit brainwaves over wifi.
“A lightweight battery-free headset can continuously monitor human brainwaves, and is powered by body heat and sunlight.
The portable electroencephalogram (EEG) device resembles a set of headphones. It could provide wireless monitoring of patients at risk of seizures, have cars or other machinery respond to stressed users, or provide new ways to interact with computer games.”
(more at newscientist)