A reporter for the LA Times chronicled her experience trying out Google Glass around San Francisco.
It’s in the on-line version of the article under Pros and Cons. I posted a comment (see at bottom).
Tissue heating is a sign that a device is producing excessive levels of radiofrequency/microwave radiation and the battery-switching function is producing high ELF-EMF. She reported a hotspot at the temple, although the antenna is located behind the ear.
"Listen to both sides and you will be enlightened; heed only one side and you will be blinded. We are facing a big knowledge gap in evaluating EMF health risk at this stage. This is the reason why there is no satisfactory and generally acceptable EMF standard around the world. I think an international EMF exposure standard might only be established on the principle of science and democracy, on the principle of mutual understanding and to reach unanimity through consultation." - Opening remarks by Professor Huai Chiang at the 3rd International EMF Seminar in China, 13-17 October 2003.