Only a Trillion is a collection of ten science essays and three scientific spoof articles by Isaac Asimov. It was the first collection of science essays published by Asimov. It was first published by Abelard-Schuman in 1957. A paperback edition published by Ace Books in 1976 included updates of outdated material (re-issued in 1980). The book was also published under the title Marvels of Science by Collier Books in 1962. The title refers to the number of atoms of astatine-215 in the top 10 miles of the Earth's crust of the North and South American continents – only a trillion. Source: Wikipedia (en)