AP - When the space shuttle Columbia broke apart over Texas, it scattered 84,000 pieces of debris, and most of it has never been closely analyzed.{br}{br}View the Entire Article (http://us.rd.yahoo.com/dailynews/rss/science/*http://story.news.yahoo.com/news?tmpl=story2&u=/ap/20050302/ap_on_sc/studying_columbia){br}