> Liang's colleague, Professor S. Bradley Vinson, reaches into a plastic container where roaches are hiding between wood chips, searching for one with his bare hand.
"There's one nice cockroach," he says. "See how pretty."
It's huge: 2 inches long, an inch wide, with a hard black and gold shell. Bradley turns it upside down and its six legs kick around, the hairy, prickly spines searching for something to clasp onto.