FYI (as promised in the post), the second back of the envelope calculation thread is here: http://news.ycombinator.com/item?id=161810 http://news.ycombinator.co

FYI (as promised in the post), the second back of the envelope calculation thread is here: http://news.ycombinator.com/item?id=161810 http://news.ycombinator.com/item?id=161810