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This paper presents the results of carbon and nitrogen stable isotope analyses on human remains uncovered from Potočani, a Copper Age (Eneolithic) mass burial site in continental Croatia. The remains of at least 41individuals were uncovered in a pit in 2007 during rescue excavations in Požeško‐Slavonska county. Skeletal evidence of violence and the disorganized arrangement of bodies suggest that burial took place over a short period of time. Radiocarbon dates and associated ceramics indicate these people were part of the Lasinja cultural group, dating to the Middle Copper Age (ca.4200 cal BC). Carbon and nitrogen stable isotope analyses on 40individuals indicate higher than expected nitrogen values in comparison with other regional populations and significant differences between children, juveniles, and adults at the site of Potočani. Bioarchaeological and stable isotope results support the interpretation that the people buried at Potočani likely experienced dietary stress in the years leading up to their violent deaths.

Optical response of crystalline solids is to a large extent driven by excitations that promote electrons among individual bands. This allows one to apply optical and magneto‐optical methods to determine experimentally the energy band gap —a fundamental property crucial to our understanding of any solid—with a great precision. Here it is shown that such conventional methods, applied with great success to many materials in the past, do not work in topological Dirac semimetals with a dispersive nodal line. There, the optically deduced band gap depends on how the magnetic field is oriented with respect to the crystal axes. Such highly unusual behavior is explained in terms of band‐gap renormalization driven by Lorentz boosts which results from the Lorentz‐covariant form of the Dirac Hamiltonian relevant for the nodal line at low energies.