That alone makes it essential reading for anyone intrigued by South Africa's complex philosopher-king.

ECONOMIST: Thabo Mbeki

Greenspan truly began to think he was a monetary philosopher king who could fine-tune economic activity by manipulating short-term interest rates.

FORBES: Hamilton Got It Right--Why Can't We

Tor Butler-Cole, a philosopher and ethicist from King's College, London, thinks we should be wary of allowing this technology to be used if it is not 100% accurate.

BBC: A BBC reporter tries out a conventional lie detector