`  == Really...? ==  It claims halfway though the article that    ``In the military, ``Shelter-in-Place`` is comparable to ``buttoning up`` and has proved life saving in many instances.`` Which instances, exactly? Was there a chemical or biological attack in some war recently? I hadn't heard about it. Which exact war was it, and when was the chemical attack made? Because unless there actually was a chemical or biological attack, the only time SIP could have been used is either during training, or during false alarms. In either case, it could not have actually saved any lives, so I am dubious about this claim.  I also notice that above this, it says (among other things):   ``If the occupant's breathing-produced carbon dioxide is the only consumer of oxygen in the room then carbon dioxide levels would not begin to reach dangerous values until 3+ hours had passed, in all likely, 4 family home, scenarios.`` Carbon dioxide does not consume oxygen, to the the best of my knowledge, and are ``4 family homes`` really an good example home to use? Around here, it's usually one family per home, although that may not be the case in other places. Or perhaps you mean ``4 person family``? That would be a bit closer to the average. `