Stanford Puts Einstein to the Test - Gravity Probe B

 Principal investigator Francis Everitt - "There is a sense in which
 we all know that Einstein's theory must be wrong, or must be
 incomplete." 

 "The way that it doesn't fit with quantum mechanics is extremely,
 frustratingly deep. One or the other of these theories must be
 radically fixed," he says. 

 "It is true that there is no very convincing alternative theory to
 Einstein's. It is also true that we know the theory must break
 down somewhere. The difficulty is that nobody knows where or how it
 will break down."

 http://www.stanford.edu/dept/news/stanfordtoday/ed/9703/9703fea1.html

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