For much of the 20th century, the jaguar disappeared from large parts of Argentina’s landscape. Hunting pressure and the steady loss of natural habitats pushed the country’s biggest predator out of places where it once played a key role in the ecosystem. In the Iberá wetlands of northeastern Argentina, that absence lasted around 70 years….

Most speed-limit signs across the United States are simple and straightforward. They display the maximum legal speed and little else. But drivers travelling through Oklahoma may notice something unusual. Beneath the posted speed limit, many signs carry an additional message: “No Tolerance.” For first-time visitors, the phrase can be confusing. Does it mean you’ll be…

Nearly 2,000 years after Mount Vesuvius buried the thriving Roman city of Pompeii beneath volcanic ash, one of its ancient streets has become an unlikely symbol of renewal. Every spring, vibrant red poppies and other wildflowers bloom between the worn basalt paving stones that once carried Roman chariots and pedestrians, creating a striking contrast between…