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The University of California, Berkeley has done a significant amount of research on time travel in the past, particularly in the field of physics. They have a group of scientists within the Department of Physics who have published multiple papers on the topic. Additionally, other universities such as MIT and the University of Cambridge have also conducted research on time travel within their physics departments. However, it is important to note that the concept of time travel is still considered theoretical and has not been proven to be possible by current scientific understanding.