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:::::Frank, inventors and doctors and engineers don't typically even bother learning relativity.  Should I repeat that?  Complain to engineering departments and medical schools if you think that should change.  Nothing useful has even been designed or built using relativity.  If you want to look and look and look for a counterexample then you'll be wasting your time.  I'm not going to waste mine.  This is my final reply on this topic for now.  Do something logical, such as editing the Bible, and after benefiting from that experience we can revisit this issue in a month or so.--[[User:Aschlafly|Andy Schlafly]] 15:52, 6 January 2010 (EST)
 
:::::Frank, inventors and doctors and engineers don't typically even bother learning relativity.  Should I repeat that?  Complain to engineering departments and medical schools if you think that should change.  Nothing useful has even been designed or built using relativity.  If you want to look and look and look for a counterexample then you'll be wasting your time.  I'm not going to waste mine.  This is my final reply on this topic for now.  Do something logical, such as editing the Bible, and after benefiting from that experience we can revisit this issue in a month or so.--[[User:Aschlafly|Andy Schlafly]] 15:52, 6 January 2010 (EST)
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::::::Why does it matter whether the users of the invention learn relativity?  Most users of microwaves never learn Maxwell's equations either.  That doesn't mean that the laws are irrelevant to the gadget's operation.
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::::::Likewise, the engineers who correct the clocks of GPS satellites may not know or care that relativistic effects are behind the clock skew.  But that dodges the point that relativistic effects are real, observable, and must be corrected for in several useful inventions.--[[User:NgSmith|NgSmith]]
    
== GPS revisited ==
 
== GPS revisited ==
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