AP - Research at the University of Minnesota could help fight a parasite that may have killed up to half the North American bee population in the past year.{br}{br}View the Entire Article (http://us.rd.yahoo.com/dailynews/rss/science/*http://story.news.yahoo.com/news?tmpl=story2&u=/ap/20050301/ap_on_sc/bee_pests){br}