Every summer I try to discuss the potentially serious problems of heat-related medical illness in this column or on the KMHL radio program. It seems logical to include such a discussion at this time as we review the many aspects of water usage; lack of proper water balance is the prime consideration in these serious summer illnesses. We are likely to experience bouts of high temperatures and uncomfortable humidity readings, and we need to review appropriate information about the effects of the sun and its heat on our bodies. I was reminded about this topic when speaking with an Australian friend recently about the laws in Australia regarding sun exposure. All persons on Australian beaches are required to use sunscreen, wear a hat, and cover their entire bodies. These prominent measures are required because of the very hot sun conditions in that area which have resulted in a high incidence of sun-related medical conditions, especially lack of proper hydration acutely and the development of malignant melanomas of the skin chronically.