Guido at Google

[Peter Hansen]

Bengt Richter wrote:
[roughly "an inch is not exactly 25.4mm"]
> At least according to my dusty 37th Edition Handbook of Chemistry and Physics (c) 1955.
> Maybe things have changed since then ;-)

Wikipedia concurs with Jim, though it says the official change dates 
from 1958.

Better throw that old book out, as it's also likely to be missing any 
reference to useful elements such as Lawrencium (1961), and Hassium 
(1984), not to mention Ununnilium, Ununumium and Ununbium (94, 94, 96 
respectively) or the most recently discovered element, which the PSU 
tried to supp