The best-selling author of “Sapiens” and “Nexus” discusses the core delusions deranging our politics.

An obsession with the most doomer prospects of A.I. is blinding progressives from thinking about serious, realistic policies.

Three centuries late and not a moment too soon.

The cost of Nayib Bukele’s crackdown on crime is too high.

The president’s $1.8 billion slush fund is causing further cracks in the Republican Party.

Readers discuss court cases about campaign finance. Also: Computer science and the humanities.

How can Cubans move forward if they aren’t ready to reckon with their past?

Trump is giving “the fix was in” new meaning.

First on Democrats’ to-do list must be banning gerrymandering, restoring voting rights protections and reforming the Supreme Court.

The country seems to be tiring of the Trump era. Now what?