Blood

They, too, have been known to toss and turn at night.

There were complaints that the pause would undermine confidence in vaccines. But it would have been more disastrous for the F.D.A. to be seen as ignoring or covering up the issue.

For centuries, curiosity about the mystical and biological functions of blood has fuelled both dangerous misunderstandings and revolutionary discoveries.

“Over the next two weeks, it became clear that the house at 1406 Eighth, with its three bedrooms, would be home to at least twelve people, though that number was fluid.”