This is a talk that I gave at the University of Michigan in February — during those glorious days just before we went into the global coronavirus lockdown. It seems like it was so long ago that I traveled out there and gave this talk to a packed room full of people … Many things have changed since then. Hopfully we will get back to normal soon and we can start getting together for talks again rather than having to watch them on computer screens.
This is a discussion post, so please feel free to ask questions, present arguments, and drive the coversation deeper below.
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