Linked from
The 18 pages that link to Hair, each with the reason it gives.
ShampooNarrower topic: Shampoo cleans the hair fiber as well as the skin from which it grows.
BarberNarrower topic: Hair’s structure and growth determine how it can be cut and styled.
FurNarrower topic: Fur is a dense coat of mammalian hair, rather than an individual filament.
PonytailNarrower topic: The ponytail is formed from lengths of hair drawn together.