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A physicist sat in the first row. Behind him sat a mechanic and a marketing assistant who appeared to be a couple. In the last row, the nanotechnologist, purposefully far removed, sat observing the others. The man at the podium had been speaking for an hour and was finding his offer to be a tough sell. His audience had visible regrets, outwardly questioning his every word. But all four were essential and the man aimed to convince them.