'It's quite obvious from the article that the amounts of magnetite invvolved are not "natural" (as, for example, might be found in pre-industrial societies)....'
I didn't infer that; I got that the ratio of "jagged" to spherical magnetite was quite high.
'...What are you postulating there? And upon what basis are you hypothesizing that "naturally occurring" particles would change shape to mimic the results of combustion?
I asked a question; I didn't hypothesize anything. What makes you (or Dr. Maher) think that inhaled magnetite would be spherical in shape?
From the article:
'Furthermore, said Maher: "We also observed other metal-bearing particles in the brain, such as platinum, cobalt and nickel. Things like platinum are very unlikely to come from a source within the brain. It is a bit of an indicator of a [vehicle] catalytic converter source."'
Of course, Pt, Ni, and Co are not "metal-bearing particles". The article does not give any reason for the assumption that the source of inhaled magnetite particles would be fuel combustion.