We all know the inherent dangers that come with living in or around the nation’s capital — we’re always a step away from a terrorist attack, Biblical plague, or three inches of snow. But Fairfax County isn’t sitting around not doing anything about it, we learn today from the Examiner. Some 40 experts in emergency preparedness are set to teach free classes on a variety of emergency-related subjects on March 18, including “Building 72-hour Kits,”…