But in only 15 do you need government permission to be a tattoo artist, and in only 13 is a license required to be a cab driver.

FORBES: Worker's Permit

He also singled out New York police Detective Ivan Marcano, who was off duty in the Bronx with his girlfriend when he saw muggers attack a cab driver.

WSJ: Obama hails courage of nation's police officers

The driver of the cab survived.

CNN: STORY HIGHLIGHTS