Some dolphin species face the threat of extinction, often directly as a result of human behavior. The Yangtze River Dolphin is an example of a dolphin species which may have recently become extinct.

The monogram "RR" for Rolls-Royce has never been altered, except for when Sir Henry Royce passed away in 1933. Then it was changed from red to black.

The first open heart surgery was performed by Dr. Daniel Hall Williams in 1893.

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