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Consider the infantry assault against enemy entrenchments in the First World War of 1914-1918. In that war it was found, as would be expected, that during these assaults tall men were shot down by machine gunners considerably more often than sort men were.Being taller is a hereditary factor that has many advantages but not with infiltrating solders in First World War. More, we would not care if this tall solder's father died in a similar situation. We need to focus on the true causes of disease, the factors that interact with our make-up and results in disease. Focusing or hereditary factors distract us.