The great Nato enlargement debate never ends. In the 1990s, US officials and academics argued about whether pushing the North Atlantic Treaty Organization (Nato) into Eastern Europe was likely to sustain the post-Cold War peace or prematurely end it. More recently, critics have charged that Russia’s war in Ukraine is a natural response to the aggressive expansion of America’s most ...

We are now in Covid limbo. Cases are down and still falling, yet scientists aren’t willing to declare the pandemic over — or, conversely, to predict when the next wave might come. But perhaps it’s a good thing that public health officials are displaying a little less confidence. Researchers don’t really know why pandemic waves rise or fall, so it ...

  Insulin has been making life better for people with diabetes since it first saved the life of a Canadian teenager in 1922. As the ensuing century passed, however, the drug also became a poster child for the dysfunctionality of America’s drug-pricing system. More than 10 million Americans rely on insulin to control their blood sugar, and the out-of-pocket cost ...