With the recent earthquakes in Haiti and Chile, our own personal emergency response systems should be at the forefront of our minds.  While earthquakes are not very likely in many parts of the United States, thousands of other dangers surround us every day.  What if you live far from medical help and suffer sudden cardiac arrest?  What should your partner do?  What if a coworker collapses in your office?   You should take an inventory of the potential dangers in your life and take the precautions necessary so that you can respond properly should an emergency occur.  Most of us should probably have an emergency oxygen system on hand at home and at work.