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"The Solo Oscillation"

“The Solo Oscillation” – When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration, on THE BIG BANG THEORY, on the CBS Television Network. Laurie Metcalf returns as Sheldon’s mother, Mary.