The early Christian writer Tertullian once said, "The blood of martyrs is the seed of the Church." That takes on a strange irony in the case of Michael Servitus.
By the mid-1500s the question of how blood flows through the body was becoming a real puzzle. For 1400 years we'd believed what the Roman doctor Galen told us.
Click here to read or hear the whole story by Engines of our Ingenuity writer John H. Lienhard.
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