$1 in compensatory damages means the jury decided that yes it was technically defamation, but that it was literally the smallest, tiniest, itty-bittiest amount of defamation that is possible. That it did about the same amount of damage to the scientist's career and reputation, as if he'd ordered delivery and discovered a can of soda was missing.
The idea that you could do $1 of damage and your punishment is $1,000,000 is just nonsensical. Either it did extensive damage to his career (years' worth of salary lost) and a million dollars is appropriate additional punishment, or it didn't and he wins a dollar because he was defamed but it did virtually no damage and the defendants merely have to pay his court costs or something.