This made me wonder about the concept of integrating detection for things like carbon monoxide into cellphones. Of course there's a patent on the concept: http

This made me wonder about the concept of integrating detection for things like carbon monoxide into cellphones. Of course there's a patent on the concept: http://www.google.com/patents/US20080303678 http://www.google.com/patents/US20080303678 But I don't know if this has ever actually been attempted.