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You may be familiar with the TV show 鈥淲ho Wants To Be A Millionaire?鈥� Colorado has launched its own version, and all residents who are vaccinated against COVID-19 are eligible to win. The state announced it will give away $1 million weekly between June 4 and July 7, using federal CARES Act money that would have gone to vaccine advertising. But how well vaccine incentives actually work remains a bit of an open question.