Computers challenge human smarts

Artificial Intelligence is in the public eye this week with as machine and man face off

Every two years or so, computer speed and memory capacity doubles - a head-spinning pace that experts say could see machines become smarter than humans within decades.

This week, one test of how far Artificial Intelligence has come is happening in Seoul: a five-day battle between man and machine for supremacy in the 3,000-year-old Chinese board game Go.