Decades ago, archaeologists unearthed two large Neolithic stone tombs in northern Spain dating to the fourth millennium B.C. that contained the remains of more than two dozen men, women and children, in addition to flint arrowheads, bone awls, stone tools and pottery fragments. Now, a new analysis of the people’s bones has revealed that a huge number of them were fractured and fragmented perimortem — around or just after the time of death.