Allen: Thanks for stepping forward and I appreciate your insight and experience. I work with orthopaedic injuries and we often find that are days where the barometric pressure is dropping people complain more about aches and pains then on clear days. So, we now know that in different parts of the body of most mammals there are many different receptors that respond to temperature, pressure, hot and cold. The receptors located in the joints are known as 'baroreceptors' and respond to changes in ambient pressure. One could infer that it was very important in another time to know when the weather was going to change to either get to cover or move to high ground. I often wonder if these receptors would allow birds and other animals to predict weather and seismic events. Arnold