A major cause of the Roman Empire's decline, after six centuries of world dominance was its replacement of stone aqueducts by lead pipes for the transport and supply of drinking water. Roman engineers, the best in the world, turned their fellow citizens into cripples. Today our own "best and brightest," with the best of intentions, achieve the same end through childhood vaccination programmes yielding the modern scourges of hyperactivity, learning disabilities, autism, appetite disorders, and impulsive violence.