dr. rob semper. >> good morning, everyone. and welcome to the plaza, one of the wonderful things about the new exporatorium is that we have this wonderful outdoor space as well as in door space and would i like to think of us as an inside out museum and invite, and those that have come behind us outside of the plaza. >> when i first came in, 1977, i was privileged to join, a band of 35 people who already had been working for 8 years with frank in the palace of fine arts a place dedicated to the proposition that individuals need to be encouraged to ex-mror the world to ask the only questions and by learning and doing. it was an appropriate place, and over the years, the staff and volunteers in the palace of fine arts established exist and produced 500 programs and hired 5,000 high school kids to be the ex-plainers. we built exhibits for over 100 museums from around the world and we design the museums for places as diverse as china and turkey. we published hundreds of papers on the work that we were doing about learning. we are