Journalism professor Matt Carroll, a former Boston Globe Spotlight team member, publishes his TED talk about the stakes as investigative reporting suffers in the media's decline: "In 1990, there were 57,000 journalists covering school boards, crime and doing investigations. Now there’s a few more than 30,000 reporters out there. Think about that. Half as many reporters as back in 1990. That makes it tough to cover high school football, never mind do investigations."