Mainly, the more faddish and newer stages of life are really just marketing schemes. Tweenhood. The young old. The quarter-life crisis. You can sell a lot of junk to a lot of people by inventing a stage of life and giving it a name.

History is only written from what remains.

Epidemiologists study patterns in order to combat infection. Stories about epidemics follow patterns, too. Stories aren't often deadly, but they can be virulent: spreading fast, weakening resistance, wreaking havoc.

Folklore used to be passed by word of mouth, from one generation to the next; that's what makes it folklore, as opposed to, say, history, which is written down and stored in an archive.

History is hereditary only in this way: we, all of us, inherit everything, and then we choose what to cherish, what to disavow, and what to do next, which is why it's worth trying to know where things come from.

The study of history requires investigation, imagination, empathy, and respect. Reverence just doesn't enter into it.

The Constitution is ink on parchment. It is forty-four hundred words. And it is, too, the accreted set of meanings that have been made of those words, the amendments, the failed amendments, the struggles, the debates – the course of events – over more than two centuries. It is not easy, but it is everyone’s.

To write something down is to make a fossil record of a mind.

Between 1900 and 1930, the percentage of PhDs awarded to women doubled, and then, for three decades, it fell.6 The gains made by women in the beginning of the twentieth century were lost, everywhere, as women who had fought their way into colleges and graduate programs found that they were barred from the top ranks of the academy. No structural changes had been made that would have allowed women to pursue a life of the mind while raising children: many quit; many were kicked out; most gave up.

The last peace had created the conditions for the next war. Out of want came fear, out of fear came fury.