Dr Tim Maloney and Andika Priyatno work at the site in a cave in East Kalimantan, Borneo, Indonesia, March 2, 2020. The remains, which have been dated to 31,000 years old, mark the oldest evidence for amputation yet discovered. And the prehistoric “surgery” could show that humans were making medical advances much earlier than previously thought, according to the study published Wednesday, Sept. 7, 2022 in the journal Nature.(Tim Maloney/Griffith University via AP)