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  1. en.wikipedia.org › wiki › Elsa_LöwenthalElsa Einstein - Wikipedia

    Elsa Einstein (18 January 1876 – 20 December 1936) was the second wife and cousin of Albert Einstein.Their mothers were sisters, making them maternal first cousins, and further, their fathers were first cousins, making them paternal second cousins.

  2. In the theory of general relativity, the equivalence principle is the equivalence of gravitational and inertial mass, and Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference

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