Over the years, there have been many challenges to the second law of thermodynamics— that law that says there is no free energy and you can’t get something for nothing— some of them have been valid, some have not. In a recent experiment from Japan, it was found that quantum entangled particles take that second law and just blow by it like it wasn’t even there. Free energy? Apparently so.
Quantum entanglement, a puzzling quantum phenomenon that Albert Einstein called “spooky”, is generally thought of as only working between quantum particles. But if it turns out that it also works between points in time, it could be a key to future time travel.