Readers respond to an article about staying mentally sharp in retirement.

Striking the Iranian-backed Houthi militia serves United States interests, and puts pressure on Iran over its nuclear ambitions.

Three months into the Trump administration, it is clear that many of the Americans refusing to back down or stay silent are ordinary people.

For the billions of people who still live in poverty, the path to prosperity may look very different than it has since World War II.

It doesn’t just protect a person’s liberty and dignity. It’s a humble acknowledgment of our own limitations.

Law firms and universities do not need to capitulate. Here’s how they can fight back.

I didn’t know how to tear down that wall of silence and mystery that creeps up between parents and their teens, but I knew doing so was essential.

In Mike White’s show, love and money go together.

What Trump’s dramatic revision of the global trade system is intended to accomplish — and reasons for skepticism.

The trade economist Paul Krugman parses the ‘layers of wrongness’ in Trump’s tariff policy.

The trade economist Paul Krugman parses the ‘layers of wrongness’ in Trump’s tariff policy.

Donald Trump’s tariff regime is a self-inflicted disaster.

The world was just as intertwined 100 years ago, and its unraveling was a disaster. Can we avoid the same outcome?

Israel’s ‘Gazafication’ of the West Bank displaces 40,000 residents of refugee camps.

Readers debate what the party must do to compete with Republicans in the coming elections.

Federal workers can become the standard bearers of the Democratic opposition.

The country’s martial law fiasco is a stark warning for democracies everywhere about what happens when political polarization spirals out of control.

Given the country’s extreme polarization, there is something to be said for giving voters a voice in judicial elections unconstrained by district lines in gerrymandered states.

Readers offer views on the state of American universities that go beyond the stereotypes. Also: Fatal U.S.A.I.D. cuts; college using police tactics.

Here is what has happened in Ukraine: nothing. There’s no sign that Putin is preparing to stop fighting, despite Trump’s talk of cease-fires and deals.

America is in a period of profound national regression. Where will the country end up?

Justin Wolfers on how the tariffs will radically change our daily lives.

The task before higher education is immense.

In a world lurching rightward, Mexico’s president offers progressives hope.

His belief that liberal democracy has failed and that technologists should lead can be traced to the unusual life of his grandfather.

Rising cancer rates in young adults deserves a federal study.

The exaggerated government claims and ensuing public concern about Tren de Aragua’s activities in the United States amount to a classic moral panic.

Donald Trump is upending a world that has brought peace and stability for 80 years. What is it he doesn’t understand?

What the controversy about Jasmine Crockett’s comments got wrong — and right.