On Monday, 21 February, at 1 p.m. EST Ian Baldwin, a molecular ecologist at the Max Planck Institute for Chemical Ecology in Jena, Germany, will discuss his studies of how plants use chemical signals to fend off hungry insects or attract helpful pollinators at a live web chat from the AAAS meeting in Washington DC.. He proposed the controversial "talking trees" hypothesis 25 years ago, and today agricultural researchers are keen to apply his findings toward improving pest resistance in crops. To join in or post questions, see http://news.sciencemag.org/sciencenow/2011/02/live-aaas---ian-baldwin-on-plant.html