Physicists at CERN have directly observed fluid-like behaviour in the quark–gluon plasma that filled the early universe. Experiments at the Large Hadron Collider revealed wake-shaped ripples forming behind fast-moving quarks, similar to bow waves in liquids. These quark wakes confirm that the primordial “soup” of quarks and gluons behaved as a near-perfect, low-…​Physicists at CERN have directly observed fluid-like behaviour in the quark–gluon plasma that filled the early universe. Experiments at the Large Hadron Collider revealed wake-shaped ripples forming behind fast-moving quarks, similar to bow waves in liquids. These quark wakes confirm that the primordial “soup” of quarks and gluons behaved as a near-perfect, low-…  ​ science