Constantin von Economo announced the spread of encephalitis lethargica / Peak District became UK's first national park - April 17

On this day in 1917, neurologist Constantin von Economo announced the probable spread of a viral disease, encephalitis lethargica, at a spread of a viral disease at a meeting of the Vienna Society for Psychiatry and Neurology. / On this day in 1951, Peak District National Park was established.

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