I seem to recall an experiment in which subjects told to think about a hard problem for two hours had a significantly lower success rate than subjects told to think about it for half an hour, go play sudoku for an hour, then think about it for another half an hour. But grep and google are coming up empty for me at the moment, so take this with a grain of salt.
I seem to recall an experiment in which subjects told to think about a hard problem for two hours had a significantly lower success rate than subjects told to think about it for half an hour, go play sudoku for an hour, then think about it for another half an hour. But grep and google are coming up empty for me at the moment, so take this with a grain of salt.