I sat back and rubbed my eyes. It brought a moment of amusement. Who am I performing for, anyway? One of the advantages of being a software emulation was that I never got tired, never needed rest, never needed to eat or go to the bathroom. My ability to concentrate on a problem had been legendary when I was alive. Now, I felt all but invincible. My only concession to my former humanity was to occasionally switch research topics just to keep fresh.