(William Gibson retweeted)
When Science Fiction Grew Up
http://conceptualfiction.com/whenscifigrewup.html
In the summer of 1957,
just a few weeks before the launch of the first Sputnik
space satellite, some 23 science fiction magazines
were operating in the United States. By the end of 1960,
only six remained. During a period of just 28 months,
fifteen sci-fi magazines disappeared from the magazine
racks.