Thought for the month

“To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.” Lao Tzu, philosopher (6th century BCE).

Wednesday, 30 January 2019

Periodic celebration
The United Nations has proclaimed 2019 as the International Year of the Periodic Table of Chemical Elements being 150 years since Mendeleev produced the first version. An 1885 version, printed in Vienna by Verlag v Lenoir & Forster, has been found at the University of St Andrews. It was bought by mail order in 1888 for three German goldmarks, the equivalent of about €20/$22/£17 today.

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