Bulgarian local guide Zhelyazko Velikov shows the excavations site at the Bacho Kiro Cave, near the city of Dryanovo, northern Bulgaria, on May 13, 2020. Scientists say a tooth and bone fragments discovered in the Bulgarian cave of Bacho Kiro have revealed the earliest proven presence of Homo sapiens-or modern humans-on the European continent. (Photo/Agencies)
A local guide and visitors walk in the site of the Bacho Kiro Cave, near the city of Dryanovo, northern Bulgaria, on May 13, 2020. Scientists say a tooth and bone fragments discovered in the Bulgarian cave of Bacho Kiro have revealed the earliest proven presence of Homo sapiens-or modern humans-on the European continent.(Photo/Agencies)
Bulgarian local guide Zhelyazko Velikov walks inside the Bacho Kiro Cave, near the city of Dryanovo, northern Bulgaria, on May 13, 2020. Scientists say a tooth and bone fragments discovered in the Bulgarian cave of Bacho Kiro have revealed the earliest proven presence of Homo sapiens-or modern humans-on the European continent.(Photo/Agencies)
A guard unlocks the entrance of the Bacho Kiro Cave, near the city of Dryanovo, northern Bulgaria, on May 13, 2020. Scientists say a tooth and bone fragments discovered in the Bulgarian cave of Bacho Kiro have revealed the earliest proven presence of Homo sapiens-or modern humans-on the European continent.(Photo/Agencies)
