In the past there have been several major cases involving environmental health and public safety, including asbestos in schools, arsenic in the water system and Alar and PCBs in food. In such cases some quarters sounded the alarm, others said the public was safe, and both had science on their side. The questions then arise: whom are we to trust and how are we to know? Amid this chaos of questions and conflicting information, this text provides a factual...