The "young invincibles" are what health policy wonks call healthy young adults (18-30) who don't see being uninsured as a problem. But it is a problem, at least for the success of the Affordable Care Act. That's why the Department of Health and Human Services is spending $30,000 on prizes for a national video contest, in a frank appeal to the YouTube generation. The digital demographic may not know co-pays from co-insurance, but creating and uploading free "content" practically defines that generation. HHS hopes to tap that creativity and essentially get young adults to market Obamacare to themselves.