A version of this article also appeared in the It’s Not Just You newsletter. Sign up here to receive a new edition every Sunday. And write to me at Susanna@Time.com. In Sinéad O’Connor’s new memoir “Rememberings,” there’s an incredible chapter about the first time the Irish singer-songwriter-activist shaved her head. Barely 20, it was the…

Britney Spears and Sinéad O’Connor: A Tale of Two Haircuts