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The speed limit on our spacetime highway of life is c - lightspeed. Surprisingly, the posted minimum is also c. We can go no faster, nor any slower! The conversion factor from the time dimension to space is ct. When stationary in space, we must move into the future at c to have our clock tick off t. When moving in space, the spacetime vector c tilts from pure motion in time. The faster we move in the space dimension, the slower we move in the time dimension.
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