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What's the point of professionals and experts if they don't communicate clearly and precisely? Why even have him on a podcast?

Communicating technical concepts to lay audiences is difficult, and a universal problem these days.

Very rare and impossible are nearly equivalent wrt policies that broadly and significantly impact personal health and liberty.

I agree that communicating these concepts is hard, but that characterization of "very rare" and "impossible" only makes it harder.

Pandemics are very rare. Flying unicorns shooting Ebola out of their horns are impossible.

Nope. Genetic engineering and bioweapons could very make the latter a reality. And that's why you don't try to be pendantic.