It’s not quite time travel, but scientists appear to have reversed the arrow of time in quantum systems. The “arrow of time” is the concept that natural processes run forward, not in reverse. An international team of researchers was able to show that given specific conditions, heat can flow from a cold quantum particle to one that’s hotter.
The arrow of time is derived from the second law of thermodynamics, which says that entropy increases over time. Entropy is the measure of disorder. The law explains why it’s hard to unbreak stuff or why a hot cup of tea will eventually turn cold. It just doesn’t usually work the other way.
What the scientists found is that “the arrow of time is not an absolute concept, but a relative concept,” as says…
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