SERBIA: Electron spin resonance, uranium series isotopic analysis, and infrared/post-infrared luminescence dating—all these advanced techniques were applied to determine the age of a hominin jawbone found in a cave. The mandible, with three molars attached, is between 397,000 and 525,000 years old, placing it among the oldest hominin fossils in Europe. The sample, which lacks features associated with Neanderthals and may come from a Homo erectus, might help explain how these early human lineages evolved and were distributed across the continent. —Samir S. Patel