In a small home in Madras, a young clerk with almost no formal training in advanced mathematics filled notebook after notebook with strange, dense equations, working mostly alone, often through the night, with nobody around him able to tell if what he'd written was genius or nonsense.
In 1913, with nothing to lose, he mailed nine pages of his most striking theorems to G.H. Hardy, one of the most respected mathematicians in Cambridge, England. Most such unsolicited letters from unknown strangers were dismissed immediately. Hardy nearly did the same — until he sat down and actually worked through the proofs, and realized he was looking at results so original that, in his own words, they simply had to be true because no one could have had the imagination to invent them if they weren't.
Hardy brought Ramanujan to Cambridge, where the two produced a body of work that mathematicians are still mining for insight over a century later. Ramanujan worked through illness, homesickness, and the culture shock of wartime England, filling notebooks that mathematicians are, to this day, still finding new applications for — in string theory, in cryptography, in fields Ramanujan could never have imagined.
He died at just thirty-two, having spent most of his short life self-taught, uncredentialed, and largely unseen — until one letter, and one mathematician willing to actually read it, changed everything.