In what Prof. Barkai describes as a "time capsule," the analysed calculus revealed three major findings: charcoal from indoor fires; evidence for the ingestion of essential plant-based dietary components; and fibers that might have been used to clean teeth or were remnants of raw materials. "Prof. Karen Hardy published outstanding research on the dental calculus of Neanderthals from El Sidron cave in Spain, but these dated back just 40,000-50,000 years—we are talking far earlier than this," said Prof. Barkai. "This is the first evidence that the world's first indoor BBQs had health-related consequences," said Prof. Barkai. "The people who lived...