Retina iMac hands-on: Tim Cook explains the “Wow!”

The iMac has always had a certain wow-factor, particularly in its most recent design iteration with its 5mm-thick body, but pair that with the new Retina 5K Display and you have an even more eye-catching machine. Announced at Apple's event this morning, the iMac has a whopping 5120 x 2880 display for a huge 14.7m pixels, and while that means you can't see them individually, check out after the cut for the sum impact... with a surprise interruption from Apple CEO Tim Cook to tell me about the new all-in-one's "wow" factor.