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Gray hair has more continuous medullation and a higher medullary diameter than black hair.

Male and female scalp hair differ in size, density, length, curliness, pigmentation, and cuticle preservation.

Pubic hair is thicker than axillary and scalp hair, useful for forensic identification.

Red fox, golden jackal, and gray wolf hairs have similar features but differ in length, thickness, and inner structure.

Both cyproterone acetate and spironolactone effectively reduce hair growth in women with hirsutism.

Hair is mostly made of three protein types: helical, high-sulfur, and high-tyrosine.

Antler velvet hair and body hair of red deer have different structures that help with protection and insulation.

OCT can identify hair structures, but chemical treatments can damage them.

Stretching damages Caucasian hair's structure more easily than Asian hair.

Microscopic hair features can identify different Cauda Cervi species.

Lipids in Japanese hair help maintain glossiness and structure.

Human beard hair medulla contains a unique and complex mix of keratins not found in other human tissues.

Hair is a complex organ, and understanding its detailed structure and growth phases is crucial for analyzing substances within it.

The document explains how hair is studied in forensics to identify its source and its role in criminal investigations.

Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.

Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

OCT can effectively examine and reveal details about human hair and scalp conditions.

Spironolactone may help treat excessive hair growth in girls, but more research is needed.

Manatee whiskers are specially adapted for touch in water.

Moisture content significantly affects how human hair breaks.

South American camelids should be sheared early, fleece type affects fiber quality, and the S/P follicle ratio doesn't distinguish between Bolivian llama genotypes.

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

Fermented red ginseng and a traditional herb mix improved hair growth in mice.

Microscopes are essential for telling apart human and animal hair in criminal investigations.

The study found unique microscopic features for hair or feather in five animal ingredients in Shenrongbian pill.

Children's hair grows in different types from before birth through puberty, with growth rates and characteristics varying by age, sex, and race.

Laser hair removal effectiveness depends on targeting hair structures without harming the skin, and improvements require more research and expert collaboration.

Trichoscopy is a quick, noninvasive method to diagnose hair and scalp disorders, often reducing the need for biopsies.

The research found two types of calcium in human hair, one that varies among individuals and another that is consistent across people.

Aging makes hair thinner and rougher, with less clear edges.