The animal kingdoms of Asia and Australia are worlds apart, thanks to an invisible line that runs right between the two neighboring continents. Most wildlife never cross this imaginary boundary, not ...

Nearly 80% of Americans live east of a single invisible line, leaving almost a third of the United States surprisingly empty. Discover how geography, rainfall, mountain ranges, and a growing water ...

Our experiences of the world are diverse, often changing as we move across borders from one country to another. They can also vary based on language or subtle shifts in climate. Yet, we rarely ...

The Wallace Line runs through Asia and Australia, and shows an incongruity in the dispersion of animal species on either side. Researchers have known about the differences in the animals for over 150 ...

In the middle of the Pacific Ocean, Gonzalo Mucientes has discovered an invisible line in the sea that separates male mako sharks from females. The line runs from north to south with the Pitcairn ...