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We will learn the difference between special relativity and general relativity.
Special relativity: as velocity approaches the speed of light, mass increases, distance shrinks, time slows down, and Einstein said: All observers see light moving at the speed of light.
General relativity: gravity is caused by a warping of space, The Equivalence Principle: light is affected by gravity.

Next video in this series can be seen at:
https://youtu.be/S_HsKexcE78