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Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

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

This study observed that treating human hair with NaOH led to partially removed cuticles, resulting in better fiber cohesion and mechanical properties similar to wool, unlike bleach or formic acid treatments, which weakened the fibers.

This article reviews hair and nail disorders in children, emphasizing their prevalence, congenital and acquired origins, and the diagnostic challenges compared to treatment, but reports no new clinical results.

In this case report, researchers documented a 19-year-old male professional athlete with acquired trichorrhexis nodosa, noting environmental factors like chlorine exposure during swimming may have contributed to his condition, which improved after advice on hair care changes.