A person who was known for his work in mass spectrometry discovered Uranium-235.
  Poincar termed this to be an "insurmountable flaw" in the Mach definition of mass
 At the core of this assertion is Albert Einstein's idea 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 (i

