Frank and Peggy Taplin Member George N. Wong, Visitor Lia Medeiros, and Professor James Stone, all from the Institute's School of Natural Sciences, have developed an innovative technique to search for black hole light echoes. Their novel method, which will make it easier for the mass and the spin of black holes to be measured, represents a major step forward, since it operates independently of many of the other ways in which scientists have probed these parameters in the past.