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Ken Heart asked the Naked Scientists: I listen to you on South African Radio 702 whenever I can! Great show. The Heisenberg uncertainty principle states that in principle you can never know a particle's exact position and momentum simultaneously. However, in particle accelerators such as the one at CERN, they make images of what happens at the point of collision of various streams of particles, and obtain a kind of "track" of the resultant particles. Surely when a particle is making that "track" it's position AND momentum can be simultaneously established? After all, there's a record of it! I would be interested to hear how this sits with Heisenberg! Regards, Ken HeartWhat do you think?