Mary And The Zombies: Can Science Explain Consciousness?
"We know that our experiences - of seeing red, feeling pain, falling in love and so forth - depend on physical systems like the brain that science can, in principle, exhaustively explain. But it's hard to make sense of the idea that experiences themselves could be physical. No doubt experiences correlate with objective physical facts, but, as subjective phenomena, how could they be such facts?"
The New York Times 03/12/13 (includes thought experiments featuring Mary and zombies)