Re: Seems Herbert and Dick had similar ideas
The original Duncan Idaho was a real human, but in later books duplicate Duncans were grown in tanks.
I've just finished watching the excellent comedy series Other Space from Yahoo! that features a man grown in a tank (to be a supply of spare organs for his older brother). The series is like a cross between Red Dwarf and Community, and fingers crossed another network picks it up for a second series now that Yahoo! has gone belly-up.