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Jean Harrison of Algonquin and Jane Umbarger of McHenry, right, known as the "incubator twins", talk about their experiences on Tuesday, Aug. 21, 2018 in McHenry. The twin sisters, both 84, were among hundreds of premature infants who were placed in incubators at the Century of Progress expo in Chicago in 1933 and 1934. They also had a double wedding in 1953, which drew national attention. The sisters are featured in a new book by Dawn Raffel, titled "The Strange Case of Dr. Couney: How a Mysterious European Showman Saved Thousands of American Babies."