Amazon founder Jeff Bezos is the latest tech billionaire to come out of semi-retirement and return to the frontlines of the artificial intelligence (AI) boom that has fueled a new generation of startups.

Bezos, who is among the world’s richest people, will be leading an AI startup called Project Prometheus as co-CEO, along with former Google researcher Vik Bajaj, according to a report by The New York Times. Project Prometheus has already raised $6.2 billion in funding, partly from Bezos, making it one of the most well-financed early-stage startups in the world.

The AI startup will reportedly focus on applying AI to physical tasks, including robotics, drug design, and scientific discovery.

While Bezos has continued to focus on his private spaceflight company and SpaceX rival, Blue Orig

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