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Cat claws stay sharp by shedding their outer layer through microcracks formed during activities.

Facelifts for Asians are challenging due to thicker, heavier skin.

Reflectance confocal microscopy is useful for diagnosing and monitoring skin diseases, but it has limitations and requires expertise for correct use.

Metabolic signals and cell shape influence how cells develop and change.

Mutations in NIPAL4 cause skin issues by disrupting lipid layers, but some improvement is seen with topical treatment.

The Mitek Microfix QuickAnchor is effective and safe for endoscopic brow lifts.

Dermoscopy is an effective tool for accurately detecting skin cancers.

The effects of estrogen on human scalp hair growth are unclear and need more research.

Human hair's ability to get wet is complex and can change with treatments, damage, and environment.

Different ethnicities and treatments affect human hair strength and structure.

Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.

AFM helped show how hair changes under tension and the effects of damage and conditioner.

Repeated hair dyeing significantly damages hair.

Twist1 helps maintain important features of cells crucial for hair growth by working with Tcf4 and β-catenin.

The Msi2 protein helps keep hair follicle stem cells inactive, controlling hair growth and regeneration.

Red deer antler extract may help hair grow faster by increasing a growth protein.

TP0427736 may help treat hair loss by blocking a specific protein and promoting hair growth.

Researchers successfully grew hair follicle stem cells from mice and humans, which could be useful for tissue engineering and regenerative medicine.

The research found a way to measure hair surface changes by analyzing how light reflects off of it, and determined hair cuticle angles vary by hair length and color.

Human hair can be classified into eight types based on physical features, not ethnicity.

Curly hair shape is due to uneven growth patterns in the hair follicle.

The study found that the Marangoni effect causes the uneven wetting of surfactant-coated hair due to the surfactant moving into the water.

Curly and straight hair differ in how their internal fibers are arranged.

Hair from breast cancer patients shows changes in structure and composition, and a test using these changes detected cancer but also falsely identified some healthy samples as cancerous.

Hair analysis can show nutritional status and environmental exposure, with phosphorus being very stable in hair and differences found based on gender and conditions like depression and autism.

Permanent wave treatment with thioglycolic acid changes hair structure by altering disulfide bonds.

DNA can predict physical traits like eye and hair color accurately, especially in Europeans, but predicting other traits and in diverse populations needs more research.

Human hair is unique and important for understanding human evolution and identity.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

Adding human hair to clayey soil makes it stronger, even after freeze-thaw cycles, and is eco-friendly and cheap.