How fast does the Grim Reaper walk?

In the spirit of sharing during the festive season, please enjoy the following: http://www.ncbi.nlm.nih.gov/pubmed/22174324 Merry Christmas! Helen

In the spirit of sharing during the festive season, please enjoy the following: http://www.ncbi.nlm.nih.gov/pubmed/22174324 Merry Christmas! Helen

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How fast does the Grim Reaper walk?