Editor's note: This story has been corrected and updated.

FORBES

Correction 29 July 2011: This story has been amended after the MS Society corrected a statement it had made suggesting stem cells from the brains of aborted foetuses had been used in research it was funding.

BBC: Doctors begin major stem cell trial for MS patients

This differential has been pretty constant ever since the satellite data was corrected for orbital and sensor issues.

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