4 Hurdles to Making a Digital Brain

4 Hurdles to Making a Digital Brain | LiveScience: "NEW YORK — Futurists warn of a technological singularity on the not-too-distant horizon when artificial intelligence will equal and eventually surpass human intelligence. But before engineers can make a machine that truly mimics a human mind, scientists still have a long way to go in modeling the brain's 100 billion neurons and their 100 trillion connections."