For a relatively small mass of cellular material, cancer sometimes seems awfully clever.
I have a split reaction to the rapid spread of Zika virus.
On the one hand, it’s terrifying, especially for the young and fertile. (I don’t have grown children hoping to reproduce, but I do have many nieces and nephews in that demographic.) Our natural self-interest as living organisms and members of a beleaguered species makes it imperative that we understand and control this threat: through immunization, genetic mosquito control, whatever it takes.
On the other hand, through a cold eye, such outbreaks, as well as the cancer plague that now afflicts about one in three Americans during their lifetimes, look like Earth’s immune system trying to control the cancer that is us — sometimes with whatever blunt instrument comes to hand, sometimes with an uncanny laser-guided focus: Zika targets the brain, which is, after all, the source of the trouble. It also appears to be transmitted by sex, the other source of the trouble (being, as…
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