A jet wash operator has been called a "hero" after he came to the rescue of a woman whose car burst into flames on a motorway ...

UNITED NATIONS: A deepening political realignment across Latin America came into focus over the weekend at a summit of the Community of Latin American and Caribbean States (CELAC) and sharpened ...

Add Yahoo as a preferred source to see more of our stories on Google. At CELAC, several leftist governments attempted to push through a joint statement condemning Maduro’s detention. The effort failed ...

Abstract: We investigate Laplacian shift operators for directed acyclic graphs (DAGs). In a DAG, the adjacency matrix is nilpotent, yielding an all-zero eigenvalue spectrum that makes adjacency-based ...