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.

Recent research claims that all life on Earth originated from a single ancestor called LUCA, existing about 4.2 billion years ago. This notion is based on unprovable assumptions and circular reasoning. The conditions in the Hadean Eon were unsuitable for life, deeming LUCA a fabricated concept anchored in speculation and opposing the biblical account.