The World Health Organization has classified ELF (including electric power networks) electromagnetic fields and cell phone radiations as possibly carcinogenic (causing cancer) to humans in 2002 and 2011, respectively. Humans are today exposed to emissions from wireless communications and electricity at levels up to 1020 times the natural background radiation. What are the effects of cell phones, base stations, wireless laptops, transmitters, high voltage lines, home appliances, portable wireless devices …? This book offers essence of the most recent research results presented in a way readable by wide range of audience, and also warns of the costs and impacts of ignoring these possible hazards on the public health and environment. Practical steps to reduce exposure to these radiations are given. Moreover, the book describes unusual but very useful applications of electromagnetic fields which cover a wide range of disciplines, like medicine, agriculture, industry, seismology, engineering, mining, and environmental technology. So, medical doctors, patients, engineers, researchers, graduate students, technicians, community planners, and ordinary readers should benefit from this book.