IN the second volume of his large treatise on the integral calculus, Mr. Edwards deals with multiple integrals, gamma functions, Dirichlet integrals, definite integrals in general, contour integration ...

On Saturday, the United States, in a joint operation with Israel, killed Iran’s supreme leader, Ayatollah Ali Khamenei. For the first time in the postwar era, Washington has succeeded in killing a ...

Immerse yourself in the most compelling and consequential stories from around the globe. The world is changing in big ways every day. State of the World from NPR takes you where the news is happening ...

Natural variation in plants refers to the genetic diversity of a single plant species in the wild. Natural variation is a valuable source of beneficial traits for plant breeding. A multilayered ...