“Macabre” is not an adjective that applies to many blogs of any sort, let alone ones by Pulitzer Prize-winning science journalists. In the case of Deborah Blum’s Elemental, one of Wired‘s science blogs, it fits — because her primary subject is poison, and most often poison that’s intentionally administered in the hopes of killing someone. But Elemental is informative and fascinating as well as a tad unsettling. Blum’s recent topics include the possibility that Yasser Arafat was murdered through radiation, the world’s dumbest poisoners and the death of 23 children in India who ate pesticide-laced food at school. She’s also written five books about poison, with another in the works.