Just do the lines in quotation marks from both Tammy and Sheera: “That’s so cool!” Tammy suddenly she jerked upright, her book spilling onto the grass. “What?” “Listen to this,” Tammy said. “‘A group of people are standing in a room wearing either white or black shirts. They start throwing basketballs around. You job is to keep track of how many times the white shirts pass the ball.” “So?” “So get this.” Tammy leaned forward. “You’re so focused on keeping track that you haven’t noticed that one of the people wearing a black shirt is actually dressed in a gorilla suit!” “What do you mean, I didn’t notice him?” Sheera asked, incredulous. “I didn’t even see this thing!” “No, I mean the people who watch it pretty much never see. Guy comes out dressed like a gorilla, and they don’t even realize until they’re told about it afterward. Then they look again, and it’s clear as day.” “That doesn’t make any sense,” Sheera protested. “I would notice.” “You wouldn’t. People see what they expect to see,” Tammy told her. “They don’t care about anything else.” “I would notice,” Sheera insisted. “I’m not dumb.” “It’s not about being smart,” Tammy responded. “It’s the way your brain works. Whether you like it or not…”