[dvd3500]

........  And I meant to include in my previous post (in response to dvd3500) that Wikipedia is hardly the most trustworthy source on the internet.

All the valid points can be easily validated. Nearly every sentence cites an independent study or report.

While I agree some of the prose could be unreliable, if however within 2-3 clicks you can see the source I find it a perfectly valid place to start.