How the man was originated in the earth? When the technological developments start? The author tries to find out the answers. Dragons of Eden discuss the evolution intelligence of human and other animals through millions of years. First chapter discussed about the origin of universe, galaxies, earth, origin of life on earth and civilization. The entire technological development in the human history is happened very recently. The modern man originated in the earth only less than a million years ago. If the entire history of the universe is charted in one-year calendar and is called cosmic calendar. The calendar shows that the big bang happened in the January of this calendar, first modern man Homo sapiens emerged only on the last one and a half hour of the last month of the calendar year and all modern technology is evolved only on the last second. The technological civilization is only a few centuries old and the most advancement in the science and technology happened in the second half of this century. Large amount of information stored in a single cell in the DNA molecule. Mammals and some reptiles contain more information in the brain compared to information in DNA of a single cell. During the past 4-billon years the information in the Genes also increased but in advanced animals the information storage capacity of brain increased more rapidly. There is a direct relationship between the intelligence and Brain size of an organism when comparing different species. But among the same species there is no direct relationship between brain size and intelligence. Author says that people with low brain mass in the normal range are as intelligent as people with large brain. It is very interesting to note that the dinosaurs with huge size had only small brain. Diplodocus with weight of few Metric tones had a very small brain. The evolution of man and the evolution of human intelligence is the main theme of this book. Australopithecines are considered as ancient man. Gracile Australopithecines is the first species used tools and these tools were made from animal bones and stones. Then Homo habilus originated that had a higher brain volume. Nest point in the history of man is the origin of Homo erectus that clearly associated with campfires and is one and is only a half million years old. This book is considered as best book of Carl Sagan and got Pulitzer Prize for writing this excellent book. Many illustrations are also included in this book.

Sandeep K