http://www.nist.gov/pml/div684/constants-071911.cfm
Jim -- James R. Frysinger 632 Stony Point Mountain Road Doyle, TN 38559-3030 (C) 931.212.0267 (H) 931.657.3107 (F) 931.657.3108
[USMA:50893] The Constants They Are A Changin': NIST Posts Latest Adjustments to Fundamental Figures
This article on the 2010 CODATA might interest you. It discusses the
latest determination of the values of various constants and alludes to
some of those being given fixed values when unit definitions are next
revised.
