Quantum physicists discover 'negative time' in strange experiment

Quantum physicists are familiar with wonky, seemingly nonsensical phenomena: and molecules sometimes act as particles, sometimes as waves; particles can be connected to one another by a " at a distance," even over great distances; and quantum objects can detach themselves from their properties like the detaches itself from its grin. Now researchers led by Daniela Angulo of the University of Toronto have revealed another oddball quantum outcome: photons, , can spend a negative amount of time zipping through a cloud of chilled atoms. In other words, photons can seem...