Illustration: Sébastien ThibaultScience in the United States has never been stronger by most measures.Over the past five years, the nation has won more scientific Nobel prizes than the rest of the world combined — in line with its domination of the prizes since the middle of the twentieth century. In 2020, two US drug companies spearheaded the development of vaccines that helped to contain a pandemic. Two years later, a California start-up firm released the revolutionary artificial-intelligence ...