There was an invincible army that gave young people a proper sense of discipline and patriotism.

BBC: USSR to Promised Land

Many of these groups come across as young guys that think of themselves as invincible crusaders promoting their own version of vigilante justice.

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Here is the specific problem: Insurance companies worry that young people, especially young men, already think they are invincible, and they are bewildered about the health-care reform in general and exchanges in particular.

WSJ: Ezekiel Emanuel: Health-Care Exchanges Will Need the Young Invincibles

"They historically have been the least-insured age group in the U.S., most physicians are less suspicious of cancer in healthy young adults, and many of these patients -- once diagnosed -- may still feel invincible and be in denial, leading to less compliance with their treatments, " he said.

CNN: Pairing 'angels' with cancer patients