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Einstein referred to this as "the happiest idea of my life".
==Laboratory frame{{anchor|Laboratory|Laboratory frame}}==
In physics, the '''laboratory frame of reference''', or '''lab frame''' for short, is a [[frame of reference]] centered on the [[laboratory]] in which the [[experiment]] (either real or thought experiment) is done. This is the reference frame in which the laboratory is at rest. Also, this is usually the frame of reference in which [[measurement]]s are made, since they are presumed (unless stated otherwise) to be made by laboratory instruments. An example of instruments in a lab frame, would be the [[particle detector]]s at the detection facility of a [[particle accelerator]].
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