Einstein's Special Relativity included the discovery that physical speed slows time. The first definitive experiment was done very simply. There were two synced atomic clocks. One was stationary. The other was sent in a jet that flew around the world and back. It turned out that yes, there was a time discrepancy after all. THEN people really started to pay attention.
This video talks a bit about REAL time travel, the proven kind, which is actually called Time Dilation.
Einstein Inspires Dr. Mallett's Dream of Time Travel
Video Credit: thnkrtv
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