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  2. Waardenburg syndrome - Wikipedia

    en.wikipedia.org/wiki/Waardenburg_syndrome

    Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye ), a white forelock or patches of light skin. These basic features constitute type 2 of the condition; in type 1, there ...

  3. Premature greying of hair - Wikipedia

    en.wikipedia.org/wiki/Premature_greying_of_hair

    Premature greying of hair (PGH), also known as canities, is the process of greying of hair occurring at an unusually early age. It can have negative effects on self-confidence, self-esteem, and social acceptance of the affected individual. Hair is said to have greyed prematurely if it occurs before the age of 20 years in Europeans, before 25 ...

  4. Greying of hair - Wikipedia

    en.wikipedia.org/wiki/Greying_of_hair

    Changes in hair colour typically occur naturally as people age, eventually turning the hair grey and then white. This normally begins in the early to mid-twenties in men and late twenties in women. More than 60 percent of Americans have some grey hair by age 40. The age at which greying begins seems almost entirely due to genetics.

  5. The Best At-Home Hair Color for Women, According to DIY Dye-ers

    www.aol.com/best-home-hair-color-women-200000863...

    2. Clairol Age Defy Permanent Hair Dye. Best for Grays. For those with especially stubborn grays, this permanent color is a fan favorite for full coverage that lasts up to eight weeks. The pointed ...

  6. The Best Hair Color for Gray Hair, According to the Pros

    www.aol.com/best-hair-color-gray-hair-010000626.html

    From secretive TV ads in the 1950s to model Paulina Porizkova posting shower videos with the out-loud-and-proud gray hair statement, “For thos The Best Hair Color for Gray Hair, According to the ...

  7. These Short Haircuts for Older Women Are Timeless and Chic

    www.aol.com/short-haircuts-older-women-timeless...

    Click through our collection of the best short hairstyles for women over 50 to find variations on shoulder-length cuts, bobs, and pixies that are perfect for women of any age. Here's a quick ...

  8. Human hair color - Wikipedia

    en.wikipedia.org/wiki/Human_hair_color

    A variety of human hair colors; from top left, clockwise: black, brown, blonde, white, red. Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow ...

  9. Tetrachromacy - Wikipedia

    en.wikipedia.org/wiki/Tetrachromacy

    Tetrachromacy. The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [ 1] Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types ...

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