http://www.pbs.org/wgbh/nova/einstein/
"Speed is relative here on earth.
One can add or subtract velocities depending on which ways you move with respect to another moving object."
"Earth orbits the Sun 20 miles per second."
"TIME IS RELATIVE."
"Time flows at different rate at each other.
(Special Theory of relativity.)
Faster you move the slower your clock ticks,
compare to the stationary observer."
"At the speed of light, length shrinks to zero and time stand still."
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