Relative to comments about freezing and an emergency situation arising .... My daughter lives in Rochester, Minnesota where the Mayo Clinic is and she has told me that there has been developed a spray which will immediately go into effect and last for about an hour to get one out of a freeze. We have not had to deal with that so I don't have all the specifics, but I would think a call to the May Clinic could elicit the information. In the meantime I will ask her for more specifics and if she can get them, post them on line. Virginia Christiansen White Plains, NY [log in to unmask]