According to a new paper, it suggests that time can actually flow forward and backward.
According to the principle of quantum superposition, individual units ( for instance, of light) can exist in two states at once, both as waves and particles, manifesting as one or the other depending on what you’re testing. Rubino’s team looked at a quantum superposition with a state that evolves both backward and forward in time. Measurements showed that more often than not, the system ended up moving forward in time. But for small entropy changes, the system could actually continue to evolve both forward and backward in time.
For more, check out this Popular Mechanics/MSN story.