Excerpt
There is a story about a science professor giving a public lecture on the solar system. An elderly lady interrupts to claim that, contrary to his assertions about gravity, the world travels through the universe on the back of a giant turtle. “But what supports the turtle?” retorts the professor. “You can’t trick me, says the woman, “it’s turtles all the way down.” (The Economist, July 19-25, 2008, p. 79)
The incidence of whiplash associated disorder (WAD) varies widely, ranging from 10/100,000 in New Zealand to 328/100,000 in the United States1,2. Large regional differences may occur within the same country,…