Here: http://www.zdnet.com/article/peter-norvig-on-googles-mistrus...

I believe it considering 2006-2008 was when all the deep learning pieces came together (some parts were decades old, some 5 years, some 2 years). Google's main push in ML is with deep learning. Although, I would like to see the source too. Tried to find it using Google, but no luck! :)

"Are Machine-Learned Models Prone to Catastrophic Errors?"

http://anand.typepad.com/datawocky/2008/05/are-human-experts...