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Sponsored by Swinburne Astronomy Online at http://astronomy.swin.edu.au/sao/ Join +Fraser Cain  and +Pamela Gay for a live episode of Astronomy Cast. We'll record our 30-minute show, and then stick around to answer your questions about space and astronomy.  Astronomy Cast Ep. 370: Kaufmann–Bucherer–Neumann Experiments One of the most amazing implications of Einstein's relativity is the fact that the inertial mass of an object depends on its velocity. That sounds like a difficult thing to test, but that's exactly what happened through a series of experiments performed by Kaufmann, Bucherer, Neumann and others.