David Adam is a writer and editor at the journal Nature and was a special correspondent at the Guardian, writing about science, medicine and the environment. Courtesy of Farrar, Straus and Giroux, LLC hide caption

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Why OCD Is 'Miserable': A Science Reporter's Obsession With Contracting HIV
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Pathological nail biting may be a form of grooming on steroids, but it also makes the biter feel good, unlike fear-driven OCD. Andrea Kissack for KQED hide caption

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Nail Biting: Mental Disorder Or Just A Bad Habit?
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