the number of babies is likely to gain ground through natural selection, we can say with some confidence that incompetence in the use of contraceptives is probably on the rise (though only if those unintended babies themselves thrive enough to breed in turn). Bio-engineered micronutrients may be the most cost-effective way to help the poor Latest Mind and Matter column in the Wall Street Journal This week saw the announcement of the latest conclusions of the Copenhagen Consensus, a project founded by BjA,rn Lomborg in which expert economists write detailed papers every four years and then gather to vote on the answer to a simple question: Imagine you had $75 billion to donate to worthwhile causes. What would you do, and where should we start? Being maltreated as a child can perhaps affect you for life. It now seems the harm might reach into your very DNA. Two recently published studies found evidence of changes to the genetic material in people with experience of maltreatment. These are the tip of an iceberg of discoveries in the still largely mysterious field of "epigenetic" epidemiology-the alteration of gene expression in ways that affect later health. Peter Pringle's new book "Experiment Eleven" documents a shocking scandal in the history of medicine, when Albert Schatz, the discoverer of streptomycin, was deprived of the credit and the Nobel Prize by his ambitious boss, Selman Waksman. Streptomycin was and is a miraculous cure for tuberculosis. Yet the near disappearance of tuberculosis from the Western world, where