It appears that scientists at the Hong Kong University of Science and Technology proved recently that you can't travel faster than the speed of light in a vacuum. That discovery, howled many popular publications, means time travel is impossible. "Impossible," however, is a very powerful word. Has this research truly proven that traveling in time is absolutely and without a doubt out of reach? In fact, the discovery does not rule out time travel per se, Shengwang Du, who led the HKUST research team, told TechNewsWorld.