Taken from the January 2022 issue of Physics World where it first appeared under the headline "The twin streams of time". Sidney Perkowitz reviews The Janus Point: a New Theory of Time by Julian ...

Every moment that passes finds us traveling from the past to the present and into the future, with time always flowing in the same direction. At no point does it ever appear to either stand still or ...

One of the enormous conceptual ideas that came along with Einstein's theory of relativity was the surprise that time itself, long considered fundamental and universal, is actually relative. Different ...

Since the end of the 19th century, physicists have known that the transfer of energy from one body to another is associated with entropy. It quickly became clear that this quantity is of fundamental ...