Autism, Savantism and Daniel Tammet

Savant syndrome (pronounced /səˈvɑːnt/[1]), sometimes referred to as savantism, is a rare condition in which people with developmental disorders have one or more areas of expertise, ability, or brilliance that are in contrast with the individual's overall limitations. Although not a recognized medical diagnosis, researcher Darold Treffert says the condition may be either genetic or acquired.[2]
Savantism on Wiki

Daniel Paul Tammet (born 31 January 1979) is a writer with high-functioning autism and savant syndrome. His bestselling 2006 memoir Born On A Blue Day was named a "Best Book for Young Adults" in 2008 by the American Library Association.
Tammet's second book, Embracing the Wide Sky, was named one of France's bestselling books of 2009 by L'Express magazine in its March 2010 edition.