| http://www.w3.org/ns/prov#value | - Special relativity revealed that the speed of light is a limit that can be approached but not reached by any material object; it is the origin of the most famous equation in science, E = mc2; and it has led to other tantalizing outcomes, such as the ???twin paradox.??????General relativity??? is concerned with gravity, one of the fundamental forces in the universe. (The others are electricity and
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