Time travel is deterministic and locally free, a paper says—resolving an age-old paradox. This follows research observing that the present is not changed by a time-traveling qubit. It’s still not very ...

We all thought time travel was something out of a sci-fi movie, with DeLoreans, hot tubs, Quantum Realms, wormholes, and quirky inventors. But what if it’s been with us all along? Well, believe it or ...