The Freakonomics guys and Jared Diamond are more or less scientists. Malcolm Gladwell is a journalist. There's a difference. Both Steven Levitt and Jared Diamo

The Freakonomics guys and Jared Diamond are more or less scientists. Malcolm Gladwell is a journalist. There's a difference. Both Steven Levitt and Jared Diamond devote a lot of ink over whether or not their theories are testable, while Malcolm Gladwell tends to just find anecdotes which seem to back his theories up.