Alvin Weinberg is one of the most influential nuclear engineers & physicists in the U.S., having participated in many high profile projects from the early days of nuclear research on into the 1980s. This book is his autobiography and it's peppered with first-hand accounts of major historical events. He writes about the events of December 2, 1942, when Fermi set into motion the first chain reaction in a uranium pile and goes on to describe what happened during the "First Nuclear Era" a period he admits that has now largely run its course. A proponent of nuclear power, Weinberg also exposed its down- side risks and for years remained in the forefront of strong science administration.