If you think Donald Trump and his kind are the principal threat to the world today, think again. What, for instance, might be the impact of having billions of unemployed people? Or of a digital oligopoly seizing control of the world’s information? Technology-based challenges are coming in about 10 minutes that will dwarf any politician or political movement.

That’s the takeaway from “21 Lessons for the 21st Century” (Spiegel & Grau), Yuval Noah Harari’s frightening new book of bigthink. Harari, author of “Sapiens” and “Homo Deus,” pulls back from our current enraged squabbling about petty political disputes to consider the evolution of, say, work.

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