In the wake of the Fukushima nuclear disaster, an “unusually large hybridization event” unfolded between local wild boar and escaped domestic pigs. Within just a few years, the genetics of the two ...

The global population is growing, but do you know which city is biggest? These are the most populated cities in the world.

The Factbook, a version of which dates to 1962, provided facts, figures, maps and more to generations of economists, professors, journalists and others.

"If our hypothesized dark charge is true, then we believe there could be a significant population of primordial black holes, ...

It’s often assumed that lower birthrates could help slow climate change and A.I. disruption. The reality is more complex.