The culture that thrived at Teotihuacan in the Classic period has a unique place in Mesoamerican history. Today, it is held as an emblem of the Mexican national past and is one of the most visited ...

University of Portsmouth physicist Melvin Vopson proposes a new way to think about gravity — not just as a pull, but as something that happens when the Universe is trying to stay organized. The ...

In 2013, the oncilla (Leopardus tigrinus), a species of small spotted cat from the Americas, was split into two species: the northern tiger cat (Leopardus tigrinus) and the southern tiger cat ...