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So in my search to fine tune Mathematica to what works for me, I found a nice setting that helps separate variable declaration between notebooks. Under Global Preferences, searching for CellContext and changing from "Global'*" to Notebook does this. Sweet, but now I am having trouble clearing all the variables. ClearAll["Global`*"] no longer works, and so I figured, since that's the setting I changed, maybe it would now be ClearAll[Notebook]. However, this doesn't work either and warns that Notebook is protected.

Maybe there is a better method of operation instead of the path I'm attempting to go down. I use Mathematica to do all of my Physics homework in; between each problem I usually do a ClearAll so I'm not contaminating possible variables between problems with wrong values.

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    $\begingroup$ Perhaps this may help too $\endgroup$ – Rojo Apr 24 '13 at 10:35
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You can do

ClearAll[Evaluate[$Context <> "*"]]

Or switch the context to be unique to each group of cells.¸

Example menu setting

Depending on your needs you can also use Quit[], which will terminate the kernel, therbye clearing everything.

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