Researchers in Spain and U.S. have announced they've discovered a new property of light -- "self-torque." Their experiment fired two lasers, slightly out of sync, at a cloud of argon gas resulting in a corkscrew beam with a gradually changing twist. They say this had never been predicted before.

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Researchers in Spain and U.S. have announced they've discovered a new property of light -- "self-torque." Their experiment fired two lasers, slightly out of sync, at a cloud of argon gas resulting in a corkscrew beam with a gradually changing twist. They say this had never been predicted before.