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Well, experiments have been done that can make light move faster than the speed of light (or specifically, faster than c). The most noted one was done at the NEC Research Institute in Princeton by tunneling light through a cell filled with cesium gas. At any rate, we continue to show, year after year, how little we really now regarding physics. We're learning, but it's a slow pace in reality.
Secondly, logically it makes sense that in a universe as large as ours, there would be other intelligent life.
Now, whether they've ever been here or not... I have no clue. *shrug*
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