ScienceDaily has summarized a new study published in Environmental Health Perspectives that shows atrazine harms the development of organs, such as the heart, in baby amphibians.  Other studies have pointed to problems that the common weed killer has caused with other stages of development, but this is the first to study the impact on organ morphogenesis, or organ development. The scientists did the experiment on Xenopus laevis, or African clawed frogs. That species is the one that was shipped around the world in the 1930s and 1940s for human pregnancy tests — and unwittingly carried with it the amphibian chytrid fungus. You decide if that’s ironical.