Quote:
Originally Posted by GDB
Then shouldn't stepping/sliding kill you, or at least make you very sick? There's iron in your blood, after all.
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Only elemental iron (oxidation state 0) is found to not be "steppable". Iron +2, +3, etc can be stepped. Most of the iron in your blood and body is chemically bound in its oxidized state. I think Baxter inserted something speculation involving iron being too "stable" to be transported (being the final end product of fusion in stars), but this dialogue is quickly cut short by Pratchett saying something to the effect of "the fact is, we don't really know why, we just go with it".