The scale of the loss and depth of the grief our city suffered remains hard to put into words, but it is seared into our hearts.

The city is more vibrant, exciting and alive than ever before. But 25 years ago, none of that was guaranteed.

At a time when both US parties paint the other as a threat to the country’s future, both are ignoring one of the gravest threats of all: student achievement levels that are abysmally low.

In the push to regulate artificial intelligence, a dangerous idea is gaining ground in Washington: handing the government ownership stakes in the biggest AI companies. Both parties see immediate dollar signs. Neither is thinking longer-term. Somewhere, Karl Marx is smiling.

On John Hopkins University’s continuing legacy of leadership, innovation, and discovery

Almost two decades ago, when trillions of dollars in private housing debt proved unsustainable, governments had to step in to prevent the worst financial crisis since the Great Depression from eclipsing it. But now governments have their own debt problems, and if they don’t get them under control soon, there will be nobody to step in next time.

After 9/11, Robert De Niro and Jane Rosenthal helped make the Tribeca Festival into a powerful vote of confidence in New York City’s future. Twenty-five years later, it remains a celebration of creativity, culture, and resilience.

The decline in youth smoking is one of the great public-health achievements of the 21st century, celebrated by conservatives and liberals alike, yet the White House is now in the process of endangering it.

“A rapidly growing share of the global population lives in cities. When mayors succeed, millions of lives improve.”

We have a saying here at Bloomberg, and it’s one we brought with us to New York City Hall: “If you can’t measure it, you can’t manage it.” The federal government is now in danger of proving just how much truth those words hold.