Savant syndrome

The savant syndrome is a rare condition in which people with neurodevelopmental disorders, notably autism spectrum disorders, and/or brain injuries, demonstrate profound and prodigious capacities and/or abilities far in excess of what would be considered normal. In spite of the name syndrome, it is not recognized as a mental disorder, or as a part of mental disorder. In simple terms these are very gifted individuals with fewer than 50 alive today.
Characteristics.
These individuals in some cases may not be able to tie their shoes, however they may memorize an entire book in days. 
Notable savants.
The following are well-known people with savant syndrome, noted for their talent in their identified fields: