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Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.

The cuticle significantly contributes to hair stiffness, making up about 60% of the total bending stress.

Papain and bisulfite break down human hair by dissolving parts of it.

The dye quickly penetrates hair follicles, mainly through the gap, not the surrounding skin.

Hair in mammals likely evolved from glandular structures, not scales.

Lambs fed a liquid diet showed abnormal wool and skin, which improved with more B-vitamins, suggesting a link to B-vitamin deficiency.

Hair increases in size when it absorbs water, and treatments like bleaching affect how much water it can take in.

The 16th-century mummy's hair was well-preserved due to a calcium coating.

Polyamines are abundant in certain parts of rat hair follicles and may play a key role in hair growth.

Pollution exposure speeds up hair damage.

MSC exosome therapy improved hair quality in patients with acquired trichorrhexis nodosa.

Lysosomal proteases and cytoplasmic enzymes help hair follicle cells develop and differentiate.

Steatocystoma multiplex is a skin condition starting around age 26, linked to hair follicles, and related to eruptive vellus hair cysts.

Hair germ cells differ from epidermal cells in keratin expression, and specific keratins form after hair differentiation.

Chemical stressors damage hair structure but the skin's outer layer protects living cells.

The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.

Asian hair is generally straight and thick, with unique disorders and properties, and more research is needed to understand it fully.

Pili torti hair is fragile due to loose keratin filaments and weak disulfide bonds.

Charge-conversion chemistry improves hair-rebonding by enhancing penetration and strength.

Scanning electron microscopy and elemental analysis can help identify animal species by their hair patterns and elements.

Runx1 helps control the KAP5 gene in human hair follicles.

The 16th-century mummy's hair was well-preserved due to a calcium surface coat.

Hair damage increases significantly with higher temperatures and longer heating times.

Hair and nail cells share similar proteins, indicating a common differentiation pathway.

K6hf is a unique protein found only in a specific layer of hair follicles.

Luliconazole is more effective than ketoconazole at repairing damaged hair cuticles.

Trichohyalin is also found in the outer layers of normal human skin.

Water quality affects mineral content in hair, and coconut oil can protect against damage.

Chemical treatments severely damage hair cuticles, especially in previously treated hair.

The research found that people's hair proteins vary, especially by ethnicity and body part, which could help identify individuals in forensic science.