gbrumfiel writes: "The battle over whether to publish research into mutant bird flu got editors over at Nature News thinking about other potentially dangerous lines of scientific enquiry. They came up with a non-definitive list of four technologies with the potential to do great good or great harm: Laser isotope enrichment: great for making medical isotopes or nuclear weapons. Brain scanning: can help locked-in patients to communicate or a police state to read minds. Geoengineering: could lessen the effects of climate change or undermine the political will to fight it. Genetic screening of embryos: could spot genetic disorders in the womb or lead to a brave new world of baby selection. What would Slashdotters add to the list?"