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On 1/26/10 at 6:33 AM, smcconne at physi.uni-heidelberg.de (Sean McConnell) wrote: >Hi, whenever I try to use ElementData, Mathematica keeps returning >$Failed. >Do I need to load a particular package before using it like I would >with <<PhysicalConstants` ? No, you do not need to load a package. But the first time you use ElementData you will need to be online and have your preferences set to allow Mathematica Internet access since Mathematica will need to download the appropriate data set from Wolfram's servers.