In "Einstein's Moon" by F. David Peat there is a description of the EPR thought experiment,but I am confused by Bohr's response to Einstein given in Peat's book. In the EPR as described by Peat, particle A and particle B move in opposite directions after the entangled particle (AB) separates.(Measurement of complementary variables, position and velocity may follow, but that is not my question). If A and B are identical, B goes in one direction and A moves in the opposite direction with the same velocity My question: If I measure the velocity of particle B very precisely after they separate, please tell me which(if any) of these two statements is incorrect.. Statement #1 I will also know the velocity of particle A without measuring it with the same precision moving in the opposite direction. Statement #2 I have not disturbed particle A in any way by measuring the velocity of particle B.