It usually happens to Cherry Murray when she is about to write a paper or give a talk on a new finding or discovery. The thoughts come unbidden, hammering inside the physicist's head: 'I can't do this. I haven't done enough experiments. I haven't got enough data. I can't write the paper well enough yet or give the talk.'rnThese aren't the routine self-doubts of a young researcher. Murray is principal associate director for science and technology at Lawrence Livermore National Laboratory (LLNL) in California, and president of the American Physical Society. On 1 July she will become dean of Harvard University's School of Engineering and Applied Sciences. Referring to her work, she says: "I have to tell myself this doesn't have to be perfect."
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