In July 1937, the "Atlantic Monthly" accepted a revised version of an essay, "The World of Waters", that she originally wrote for her first fisheries bureau brochure. Her supervisor had deemed it too good for that purpose. The essay, published as "Undersea", was a vivid narrative of a journey along the ocean floor. It marked a major turning point in Carson's writing career. Publishing house Simon & Schuster, impressed by "Undersea", contacted Carson and suggested that she expand it into a book. Several years of writing resulted in "Under the Sea Wind" (1941), which received excellent reviews but sold poorly. In the meantime, Carson's article-writing success continued—her features appeared in "Sun Magazine", "Nature", and "Collier's". Carson attempted to leave the Bureau (by then transformed into the United States Fish and Wildlife Service) in 1945, but few jobs for naturalists were available, as most money for science was focused on technical fields in the wake of the Manhattan Project. In mid-1945, Carson first encountered the subject of DDT, a revolutionary new pesticide—lauded as the "insect bomb" after the atomic bombings of Hiroshima and Nagasaki—that was only beginning to undergo tests for safety and ecological effects. DDT was but one of Carson's many writing interests at the time, and editors found the subject unappealing; she published nothing on DDT until 1962.