I am "hair-blind". lol My friends discovered this recently. My memory can hold tons of useless wikipedia-inspired information, the entire pages with numbers, and 5+ languages but my brain does not record anything whatsoever related to people's hair. Say, if I talk to a person and then a second later close my eyes, I can visualise his/her face, think of his/her character, know his/her voice but I will have no clue what colour his/her hair is, how long it is, what his/her hairstyle is like etc. I know what kind of hair my family members have only because I learnt it by heart.