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Arterial Blood Gas
Wynton Marsalis won the 1997 (not 1996) Pulitzer Prize in Music for Blood on the Fields. He was the first jazz musician to win the Pulitzer.
The iron in your blood is so microscopic, it is not affected by the magnetic fields of the MRI.
I seem to recall that it represented the blood in the fields of Flanders in the Great War
he experimented with urine. and he just happened to eat blood.