The 2012 HHMI Holiday Lectures will be webcast live on November 15th and 16th. Andrew H. Knoll of Harvard University, Naomi Oreskes of the University of California, San Diego, and Daniel P. Schrag of Harvard University will guide you on an exciting exploration of the history of life on Earth and discuss present-day concerns about climate change. Click here to register for the webcast and receive a free classroom poster. If you are interested in information about hosting a live webcast event at your school, museum, or other organization, send an email tobiointeractive@hhmi.org.