The sale's 255 lots range from a 1617 text by John Napier , the inventor of the logarithm, to 14 pages of notes penciled in 1982 by J.

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Not being quite so sure ranging from believing that total feedback could be negative (an extreme view, true) through evens, to only increasing as a logarithm of CO2 levels to the consensus view of 2-4.5 oC.

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This led him to calculate that the information content of any event was proportional to the logarithm of its inverse probability of occurrence. (Unlike many popular-science books that eschew equations, Mr Vedral includes a couple and tries his best to explain them to the reader.) What does the equation mean?

ECONOMIST: Information theory