Start the experiment

"Well, I'm going to get on with the lesson." Robyn replied, "Come on, take my pulse."

Sandry sighed, backing her exposed rear against the bench to cover it as best she could, and took Robyn's readings as instructed.

"Right, I'm off for a run." Robyn smiled, and joined half of the class in jogging around the room. Sandry meanwhile wrote out the numbers, then sank down with her head in her hands.

"Nice pants!" came a voice from behind her. Sandry looked over her shoulder to see a boy she recognised as Oliver, a photographer for the school paper, pointing his camera at her, "This'll be great for the Weekly Fails page!"

"Don't you dare!" Sandry exclaimed.

"Wait, has Sandry split her trousers again?" a girl leaned over the Oliver's shoulder.

"Yeah, look." he showed her the photo on the camera display.

"Wow, cookie monster!" the girl smiled.

"Please delete it!" Sandry groaned. "You can't put that in the school paper!"

"Hey, what's up?" Robyn asked, coming to a halt next to Sandry.

"He took a photo of me." Sandry explained.

"Oh, not cool." Robyn said, "Quick, take my pulse again."

Sandry took Robyn's hand and began counting, then looked back at Oliver,

"What will it take to get you to delete that?"