I agree it was needlessly adversarial (sorry about that!) - but it got the desired effect - an excellent explanation of the concept with lots of relevant backgr

I agree it was needlessly adversarial (sorry about that!) - but it got the desired effect - an excellent explanation of the concept with lots of relevant background information (thanks, kitteh, upvoted). I think this helps the discussion a lot since a lot more people would be able to join. Less gatekeeping.