A laboratory technician presses graphite samples in an aluminum cathode to prevent contamination before the measurement process at the LMC14 Laboratory (Laboratoire de Mesure du Carbone 14) at the French Alternative Energies and Atomic Energy Commission (CEA: Commissariat a l’Energie Atomique et aux Energies Alternatives) in Saclay, southwest Paris, on May 22, 2025. (Photo by Thomas SAMSON / AFP)