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It's mostly CS related. Most of their big data systems were initiated by the Research group.

That is not true.

The very latest cool thing by Google Research or Deepmind? That would be applying reinforcement learning to datacenters to cut cooling bills by 40%.

Where do I even begin. :-) State of the art achievements in object recognition, speech recognition, reinforcement learning, natural language parsing, natural language understanding, and so on and so forth, across the board. They employ basically all the prominent names in deep learning, except for Yann LeCun and a handful of others. Their research team is worth its weight in gold.