X Stands for Unknown
 First edition | |
| Author | Isaac Asimov |
|---|---|
| Language | English |
| Series | Fantasy & Science Fiction essays |
| Genre | science essay |
| Published | 1984 (Doubleday) |
| Publication place | United States |
| Media type | print (Hardback and Paperback) |
| Pages | 218 |
| ISBN | 0-385-18915-X |
| Preceded by | Counting the Eons |
| Followed by | The Subatomic Monster |
'X' Stands for Unknown is a collection of seventeen nonfiction science essays written by Isaac Asimov. It was the seventeenth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction, these being first published between January 1982 and May 1983. It was first published by Doubleday & Company in 1984.
Contents
- Physics
- 1 Read Out Your Good Book in Verse (May 1982)
- 2 Four Hundred Octaves (June 1982)
- 3 The Three Who Died Too Soon (July 1982)
- 4 X Stands for Unknown (August 1982)
- Chemistry
- 5 Big Brother (September 1982)
- 6 Bread and Stone (October 1982)
- 7 A Difference of an 'E' (November 1982)
- 8 Silicon Life After All (December 1982)
- Astronomy
- 9 The Long Ellipse (January 1982)
- 10 Change of Time and State (April 1982)
- 11 Whatzisname's Orbit (March 1982)
- 12 Ready and Waiting (February 1983)
- 13 Dead Centre (April 1983)
- 14 Out in the Boondocks (May 1983)
- Mathematics
- 15 To Ungild Refinèd Gold (January 1983)
- 16 The Circle of the Earth (February 1982)
- 17 The Armies of the Night (March 1983)
External links
- Asimovonline.com
- 'X' Stands For Unknown at goodreads.com
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