Time was speeding up, slowing down, or even stopping

Based on this discovery: https://www.livescience.com/physics-mathematics/time-was-speeding-up-slowing-down-or-even-stopping-physicist-demonstrates-a-key-theory-of-time-by-building-a-mini-universe-in-his-lab Fable made nice summary: https://entropy.tiiny.site/ TLDR The experiment used a Bose–Einstein condensate as a small model universe to test whether time can be understood as something that emerges from changes and relationships within a closed system rather than as an external universal clock. By tracking entropy exchange between two coupled parts of the system, the researchers created an internal “entropic clock”: it ran faster when entropy changed rapidly, slowed as the system approached equilibrium, and effectively stopped when entropy exchange ceased. Importantly, laboratory time itself did not stop; rather, the experiment showed that a meaningful measure and direction of time can emerge from internal physical processes and information available to an observer, lending experimental support to ideas of relational or emergent time in quantum physics.