Einstein's special theory of relativity.
¥Einstein's special
theory of relativity was so revolutionary that many great physicists had great
difficulty accepting it.
¥Einstein's special
theory of relativity changed the foundation of physics. Its "design" was largely
based on aesthetic arguments, rather than an extensive set of observations that
could not be explained in any other way.
¥The only experimental
information that was used by Einstein (the Michelson-Morley experiment) could
also be explained by making small changes to existing theories, although it
required the introduction of unknown forces.