The newspaper article you mentioned about an alleged shark attack that occurred in 1955 at a beach in Chicago is likely referring to an incident that happened at Jackson Park Beach on July 14, 1955. In this incident, a 14-year-old boy was swimming in the lake when he was bitten on the leg. Witnesses reported seeing a fish in the water, but it was never confirmed whether it was a shark or another type of fish. The boy survived his injuries, and the incident remains the only confirmed shark attack in the history of Lake Michigan.
It is important to note that shark attacks in the Great Lakes are extremely unlikely. The waters of the Great Lakes are relatively cold, and sharks are typically found in warmer waters. Additionally, the Great Lakes are not known to have large populations of sharks, as they are not ideal habitats for these predators.
Overall, while there have been a handful of confirmed shark attacks in the Great Lakes, they are extremely rare and pose a minimal risk to swimmers and beachgoers.