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2. Artificial hair integrations - Wikipedia

   en.wikipedia.org/wiki/Artificial_hair_integrations

   The more damage the hair sustains, the shorter the lifespan of the artificial hair. Most human hair extensions can be treated as real hair, albeit more gently. *Since human hair extensions are usually heavily processed to achieve uniform color and texture, a mild shampoo is recommended, along with a light conditioner to reduce tangling.

3. Hair - Wikipedia

   en.wikipedia.org/wiki/Hair

   The human genome encodes 54 different keratin proteins which are present in various amounts in hair. Similarly, humans encode more than 100 different KRTAPs which crosslink keratins in hair. The content of KRTAPs ranges from less than 3% in human hair to 30–40% in echidna quill. [28]

4. Human vestigiality - Wikipedia

   en.wikipedia.org/wiki/Human_vestigiality

   The formation of goose bumps in humans under stress is a vestigial reflex; a possible function in the distant evolutionary ancestors of humanity was to raise the body's hair, making the ancestor appear larger and scaring off predators. [73] [72] Raising the hair is also used to trap an extra layer of air, keeping an animal warm. [72]