Physics Department Colloquia (March 18 through May 31) Tuesday, April 18 3:30 PM Clifford Cheung, Caltech: Scattering Theory Redux: Supercolliders, Fluid Dynamics, and Black Holes Tuesday, April 25 3:30 PM Jak Chakhalian: TOPOLOGICAL STATES in MAGNETIC PYROCHLORE IRIDATES Wednesday, April 26 All Day Physics/Core Curriculum Lecturer Candidate Visit Monday, May 1 All Day Beyond the Bounds of the Surface of the Earth: Gravitational Force and Gravitational Potential Energy Tuesday, May 2 3:00 PM Chandra Varma: One hundred years of superconductivity