What makes wolf spiders different from other spiders? What makes spiders different from insects? The Nature Center's Miss Rose helps Harry and George study Wolfie as a specimen, but it's Harry's little sister Polly who really makes the difference, stunning flies With a rubber band, slipping in tips when the boys are stumped, finally sneaking out at night for a forbidden look at Wolfie. She never catches her quota--a hundred flies--but she does become a full partner in the project. You might call this Pollysaturated information but it serves the purpose.