The word deepfake has become a generic noun for the use of machine-learning algorithms and facial-mapping technology to digitally manipulate people's voices, bodies and faces. And the technology is increasingly so realistic that the deepfakes are almost impossible to detect.

Some of the United States' enemies now assume, perhaps rightly, that we hate each other so much that we'd sooner collaborate with them than do the difficult work of listening to each other. It doesn't need to be this way - but national recovery won't come from Washington. It has to start with you.

Rising political tribalism, shamelessly exaggerating our opponents' claims or behavior, is leaving us vulnerable: No one loves America's internal fighting - and our increasingly siloed news consumption - more than Vladimir Putin.

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