Internationally renowned scientist Stephen Hawking has died .   His children say he passed away peacefully at his home in Cambridge, England this morning.  Hawking was diagnosed with A-L-S at age 21, but stunned doctors by living with the normally fatal illness for more than 50 years. Hawking is best known  for his groundbreaking work with black holes and relativity, and was the author of several popular science books including “A Brief History of Time.”  He was also played himself on the tv show Big Bang Theory.  Stephen Hawking was 76.  Photo courtesy

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