Modern high particle accelerators wouldn't work at all without relativity - the early cyclotron designs gave way to the synchrotons. GPS wouldn't work the way it does without relativity. These are examples of the large number of "informal" tests of relativity - thing...
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Some of the materials in the rubber industry containing heavy metals are: Antimony oxide (filler) contains lead, arsenic and antimony; chromium compounds (colorants); copper compounds (CDMC, CMBT, CDBC accelerators); nickel compounds (NDBC) accelerator, antidegradant; tellurium (TDEC accelerator); ...