It knows what cats are.
After deciphering 10 million youtube thumbnails, it discovered cats. Now google didnt say: "hey computer, this is a cat! Go find them!". The A.I. basically taught its self the concept of cats. This isnt surprising because we all know the internet is a series of tubes, and those tubes are filled with cats.
Heres a link to the full story: http://www.cbc.ca/news/yourcommunity/2012/06/google-brain-simulator-learns-to-identify-cats-on-the-internet.html
Spark notes: A.I. knows what cats are