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Stephen Hawking is alive at time of writing (January 2012)

Hawking has a motor neuron disease (MND) that deteriorates his upper and lower motor neurons. Typical forms of MND include ALS (aka Lou Gherig's disease), progressive lateral sclerosis (PLS), bulbar palsy's (which are diseases that specifically affect the corticobulbar tracts), and progressive muscular atrophy.

It has been speculated that Hawking has ALS, but this would be an extraordinarily rare case of ALS, due to the fact that most people diagnosed with ALS live ~ 14 months from diagnosis to death. Some people live anywhere between 2-5 years with the disease. Hawking has been dealing with his condition for over 40 years, so the pathophysiology involved in his disease is markedly different from typical case presentations, which are very insidious and rapidly progressive. Saying Hawking has a variant of ALS would be more accurate

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13y ago

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