A National Physical Laboratory insert in the latest New Scientist has a boxout offering a free pocket guide to SI units (International System of Units) if you email your name and postal address to SI@npl.co.uk.
Call me sad, but as I've never been able to tell yotta from yocto I've already emailed them for a copy. Alternatively, as they themselves suggested, I could just be hoping to get the edge in pub quizzes...
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