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March 21st EAS Meeting - "Black Holes and how to find them" Talk by Dr. Jessica Lu (UC, Berkeley) The population of black holes is almost entirely unexplored. Only about two dozen black holes are confidently known in our Galaxy. As a result, some of the most basic properties of black holes remain unknown. Dr. Lu discusses how she and other astronomers are using gravitational lensing to open a new window onto black holes and how the first free-floating black holes are now being discovered.