This study found that human hair exhibits significant deformation in its intermediate filaments under strain, with recovery taking about 1000 minutes, suggesting a self-healing period post-mechanical stress. Additionally, cuticle scales deform much less than the cortex, and the Poisson ratio aligns with soft matter properties.
September 2015 in “The European physical journal. E, Soft matter and biological physics/The European physical journal. E, Soft matter” In this study, a mechanical model was developed to describe and validate the effectiveness of overnight hair curling, suggesting that combining it with hair fixatives can maintain a desired curl for over a day.
January 2026 in “Nano-Micro Letters” This review discusses the principles, materials, and applications of melt electrowriting-based 4D printing for creating biomimetic scaffolds, but reports no new clinical results; it highlights recent advancements and remaining challenges in the field.
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January 2018 in “PubMed” This study in Tehran found that, after adjusting for confounders, women with PCOS had no different risk of non-pregnancy after assisted reproductive treatment compared to women without PCOS.
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December 2017 in “Cancer Medicine” This study found an association between dispensed finasteride and an increased risk of male breast cancer, though uncertainties around confounding factors and potential biases suggest these results should be interpreted with caution.