Florence Williams is a Contributing Editor at Outside Magazine. Her book Breasts: A Natural and Unnatural History was published last year.
 (April 2013)

Follow Florence Williams on Twitter: @flowill.

IN THE REVIEW

How Animals May Cause the Next Big One

People wearing surgical masks to protect themselves from the SARS virus, Hong Kong, April 2003

Spillover: Animal Infections and the Next Human Pandemic

by David Quammen
As David Quammen puts it in his masterful new book Spillover, human beings are an “outbreak,” a species that has undergone a “vast, sudden population increase.” “And here’s the thing about outbreaks,” warns Quammen: “They end…. In some cases they end gradually, in other cases they end with a crash.” If this sounds alarming, it’s meant to.