AAAS President Nina Fedoroff welcome's attendees
A video of Nina Fedoroff's opening address at AAAS 2012 is available here (starts at 40 minutes in). I thought it was very interesting. She gives an inspiring account of the difficulties that she overcame in becoming a scientist, starting with getting pregnant and dropping out of high school at 17; she explains some fascinating things about the nature of transposons and the history of their discovery; she presents a strong case for the importance of GMOs and related interdisciplinary science and engineering in adapting to climate change; and she ends with an interesting tour of international science diplomacy.
Although the video presented through membercentral.aaas.org, I believe that it's outside the paywall.
(Please don't complain about the spelling of welcome's. Everybody make's mistake's.)