Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

The flow of time isn’t as consistent as we might think – gravity slows it down, so clocks on the surface of Earth tick slower than those in space. Now researchers have measured time passing at ...

Some quantum systems may have two arrows of time, one running forwards as usual and another moving backwards. This means that, at some extremely small scales, time may have the option of moving in ...

The chain-reaction revolution in high school physics set off by M.I.T.’s Physical Science Study Committee (TIME, July 29, 1957, et seq.) will touch 12,000 students this fall. Latest link in the ...