in the time that I did a google for almost six and a half years now we have changed are cooling technologies at least five times most data centers have air conditioning units along the perimeter walls that force hold their under the floor then raises up in front of the servers angles servers in our solution we take the server rack simply put it right up against our air conditioning unit we just use cold water flowing through those copper coils and you see there so the hot air from the servers is contained in that hot I'll if raises up passes across those coils where they came from the air transfers to the water in those coils and then that warm water is them brought outside the data center cooling plant word is called out there are cooling towers every turn back to the data center and not process just repeats over and over again to meet the thing that amazes me about Google on the day the center's is the piece have been ovation and always challenging the way we're doing things so when people say that innovation in a certain area is done that we've kinda reached the pinnacle what can be achieved