This book about invisible dangers begins with a definition of “invisibility.” The term is employed here in a broader sense than is customary, to refer not merely to what cannot be seen but to anything that cannot be detected by the unaided senses. This extension to broader forms of concealment is necessary because the English language has no single word to gracefully describe that which escapes all of the senses, not merely the eyes. The dangers with which the author will be concerned are those that are not merely invisible, but which are also produced intentionally or believed to be produced intentionally. This excludes dangers that may be invisible but are undetected because of inefficiency, ineptitude, accident, or corruption. It also leaves out dangers that are invisible but clearly unintentional, such as radon gas that seeps into a home.
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