(snip) The tiny, reddish-brown parasites, which live on warm human blood, were once nearly extinct. But thanks to a growing resistance to pesticides, and an increasingly mobile human population, they’ve had a resurgence since the mid-1990s. For years, they’ve been enjoying city life, crawling out at night from all sorts of mattresses to feed. The difference now, exterminators said, is they’ve made sizable inroads into suburbia. (snip) In the past decade, most urban-dwelling bedbugs arrived on the backs of roaming college students or migrant workers from South and Central America.Once they settle and mate, their offspring will eventually set off...