Over the centuries, mankind has slowly reduced the risks and hazards that even as recently as a century ago kept life expectancy to a mere 45 years. Our average life span has improved to 77 years by remarkable progress in public health and safety. But with this improvement has come a demand for greater efforts to improve both life expectancy and the quality of life. The first edition of this book, published in 1982, was a pioneer in the development of logical, yet simple, analytic tools for discussion of the risks which we all face. This new edition, revised, expanded, and illustrated in...