![Cover of 'X' Stands for Unknown [17 essays]](https://covers.openlibrary.org/b/id/7145555-L.jpg)
'X' Stands for Unknown [17 essays]
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…
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