In 2023, the ALICE experiment was ready for their best year yet, until a mysterious signal threatened everything. As the LHC wraps up its 2025 lead-ion run, physicists recall how they worked together to solve the puzzle.
In its first five years gazing at the gamma-ray sky, the Fermi Gamma-ray Space Telescope provided new insights into cosmic puzzles ranging from dark matter to blazars—and added a few new puzzles to the list.