Abstract: Please join the UW-Madison Department of Physics for the 4th annual Physics Fair from 11am-4pm on the Saturday, the 19th of February, 2011 in Chamberlin Hall at 1150, University Ave.. This open house will be a great opportunity to learn about the research and teaching that are a part of our department. The fair will feature hands-on demonstrations, laboratory tours, activities for kids and families, a public lecture and informal conversations with scientists. The Ingersoll Physics Museum will be open, and we will have exhibits representing research groups in the department as well as displays on more general physics topics. Visit http://uw.physics.wisc.edu/~wonders/PhysicsFair.html for more details.