'X' Stands for Unknown [17 essays]

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This book is a collection of short essays on various topics in Physics, Chemistry, Astronomy and Mathematics. 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)