Hong Kong professor Shengwang Du and his team have disproved a theory for time travel.
The group of physicists at the Hong Kong University of Science and Technology measured the ultimate speed of a single photon and showed that it cannot move faster than the speed of light.
Einstein claimed that the speed of light was the traffic law of the universe. In other words, nothing can travel faster than light. But in the last 10 years some scientists have theorized that a single photon may be able to exceed the speed of light, which would make time travel possible.
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