Google Finance and Apple’s Stocks app have added new features over the years to make them more useful for tracking the markets and your investments.

Minutes after four top researchers said they were leaving, Google said that Demis Hassabis, the Nobel-winning scientist who led the company’s A.I. lab, was stepping into a new job.

Jeff Dean, who for years was one of Google’s most important executives, is leading the new artificial intelligence company with the backing of Google.

The voluntary review process will cover closed-source artificial intelligence models, but exclude those that publish the underlying code.