Jeff Dean just left Google after 27 years to found Discovery Loop to use AI to accelerate science and engineering research. AI will speed up drug discovery. It does not (yet) speed up making 400,000 doses and trucking them across a complex supply chain. As I think about the next bottlenecks in AI, I think about the real world. I'm thinking about atoms, not software. Physical, tangible, gets-stuck-in-a-forklift stuff. In addition to cleaner and more effective energy sources, we should be…