Spiders' bad reputation might be undeserved

This summer I lived in a 24th-floor Chicago apartment. Outside my window, two spiders spent a few weeks building a web together, then they flipped a coin, one left and started building his own home. After leaving a window open, I realized they were feeding off a steady stream of gnats blowing up from the city. Three weeks later, I woke up with a swollen eyelid that kept getting worse. At the doctor’s office, I had to tell him: “And, there are two spiders outside my window, so—”