Violeta Ruiz in aeon:
On 25 November 1915, the American newspaper The Review published the extraordinary case of an 11-year-old boy with prodigious mathematical abilities. Perched on a hill close to a set of railroad tracks, he could memorise all the numbers of the train carriages that sped by at 30 mph, add them up, and provide the correct total sum. What was remarkable about the case was not just his ability to calculate large numbers (and read them on a moving vehicle), but the fact that he could barely eat unassisted or recognise the faces of people he met. The juxtaposition between his supposed arrested development and his numerical facility made his mathematical feats even more impressive. ‘How can you account for it?’ asked the article’s author. The answer took the form of a medical label: the boy was what 19th-century medicine termed an ‘idiot savant’. He possessed an exceptional talent, despite a profound impairment of the mental faculties that affected both his motor and social skills.
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