Quarks know their left from their right
Physicists at Jefferson Lab have compared spin-polarized electrons bouncing off nuclei and the mirror image of that situation—achieved by flipping the electrons’ spin.
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.