Whatever does not kill a plant may actually make it stronger. After being partially eaten by grazing animals, for example, some plants grow bigger and faster and reproduce more successfully than they otherwise would. In a new study, researchers report that one secret to these plants’ post-traumatic triumph lies in their ability to duplicate their chromosomes – again and again – without undergoing cell division
Americans paid dearly for the space shuttle. Was the investment worth it? George Alexander, who covered the shuttle for the Los Angeles Times from the project's initiation in 1972 until 1985, reviews the evidence for and against that proposition. Excepted from the Summer 2011 ScienceWriters.