Re: hi EP
Before you buy what EP is peddling you might want to see what most impact scientists think. Links to more reliable sources were given at: http://www.habitablezone.com/space/messages/14820.html
The inappropriate use of Challenger crew names should be a clue as to the professional level of EP's site.
A little more research will lead you to far more cost effective approaches to dealing with the impact threat than EP's favorite.
Regards,
Mark
