At the quantum level, the past and the future are indiscernible. That could have profound effects on the world we can see.

Researchers found that because many equations allow for time reversal ... move backwards as it is for it to move forwards. “The arrow of time describes the clear asymmetry that makes the ...

A new study reveals that opposing arrows of time can theoretically emerge ... after making the standard simplifying assumption to our equations describing open quantum systems, the equations ...

When writing chemical equations for reversible reactions, the usual one-way arrow is not used. Instead, two arrows are used, each with just half an arrowhead (⇌). The top one points right ...