Neither Dia nor Zia Davis were happy with their names; it was as if their parents conspired to ensure they would never be able to reach too far beyond their status as twins. As babies and toddlers, it was fine to be dressed in the same outfits and given the same toys and placed in the same playpen. As they grew, it was amusing to hear people trip over their names and confuse their identities. In many ways, the twins felt like a single unit: definitely stronger together than apart. Then they started school. Despite their names and appearances being nearly identical, Dia and Zia showed themselves to be very different when it came to academics. Dia was the artistic type, preferring paints and palettes, whereas Zia was the mathematical type, preferring protractors and parallelograms. At home, their parents encouraged the girls to pursue their individual skills and not let the expectations of others influence them; this was often easier said than done. In high school, Zia earned excellent grades in math and science, while Dia's parents received letters concerning her subpar performance in those subjects. Dia maintained that she was doing her best, but no matter how many tutoring sessions she had, the material would never make sense to her. She claimed that math and science were "Zia's thing" and that she was content being the "darling" of the art department. One day there was an announcement at school about the first annual art festival: artwork would showcase the work of novices and up-and-coming artists. Every art student was expected to participate, and since at least one art class was required to earn a diploma, Zia had no choice but to participate. Although she didn't voice her feelings aloud, Dia was privately elated that Zia would finally be on her "turf." In preparation for the festival, the art department sponsored a "Croissants and Canvas" weekend breakfast event. Students from every art class would have the opportunity to create an original art piece and enter the piece into the competition. Their parents dropped the twins off early; while Zia lumbered into the cafeteria with the energy of a slug, Dia pranced in with the grace of a gazelle. Art materials before them, the students began to work. While Zia stared at the blank canvas before her, seemingly immobilized, Dia set to work quickly, creating an outline of a vibrant, beautiful street scene in Paris. One stroke after another brought vibrant life to Dia's work; Zia watched in amazement as one brush stroke after another brought a café, a busy street, and several people into focus. Zia knew there was no way she could even attempt to compete; she ended up signing her name at the right bottom corner of her canvas, adding the title "Snow Day" above it. The director of the art department strolled over to the twins' station and immediately gushed over Dia's canvas, praising her use of color and perspective. "Dia," he exclaimed, "this is genius. Well done!" Then he turned his attention to Zia's canvas. Zia cringed. "This is ...uh ...interesting," he said, confirming Zia's suspicion that she had utterly failed at her task. "You okay?" Dia asked, touching her sister's arm lightly. "You look like you've seen a ghost! What happened?" "Oh, nothing," Zia replied. She couldn't wait for the event to end. Soon the event drew to a close and the cafeteria cleared. The twins' parents texted that they were running late, and the girls waited outside, despite the freezing temperatures. They noticed the director of the art department walking hurriedly around his car, attempting to open each door. It became clear his locks were frozen solid; he was unable to get into his car. Throwing up his hands as the girls approached, he frantically indicated he was late for an important engagement; he was truly worried that he'd miss it. To complicate matters, his cell phone was locked in his car. Dia offered him her phone to call a locksmith or roadside service, and she was about to hand it to him when Zia stopped her. "Hey, wait ...I remember a hack I saw on one of those weekend 'Practical Science' episodes on public television. Dia, do you have any hand sanitizer on you?" Dia quickly reached into her bag, pulled out a small container of hand sanitizer, and handed it to her sister. Determined, Zia strode over to the driver's-side door and systematically pumped a few squirts onto the key, then slid it easily into the lock, opening the door with a dramatic comedic flourish. The art director laughed in amazement, uttering profuse words of thanks and hailing Zia "a genius." He quickly entered his car and pulled away, waving gratefully, just as the twins' parents pulled up. "Well, how'd it go, girls?" the twins' dad asked enthusiastically as they hurried into the warmth of the car. "We're geniuses!" they announced in unison. Paragraph 2 is significant because it -