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In collaboration with Unilever Research and Development,
Professor Raymond Goldstein and colleagues have quantified the
curliness of human hair and developed a mathematical theory
that can predict the shape of a ponytail. The work has provided
Unilever, a global manufacturer of personal care products, with
new insights into the dynamics of hair bundles and the physics of
hair tangling. One simple equation has the potential to inform the
hair-care innovations of the future.

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