Forensic Science Mystery Bellwork

#1: One Saturday morning Nina saw the three musketeers in the mall. Jenny, Brittany, and Mitzi called themselves by that name because they always were together.

 
"I've been shopping for sandals," Jenny told Nina. "But I have such a wide foot nothing seems to fit. We've been looking everywhere."

"And it's been slow going," Mitzi added. "On account of Brittany's-" "I know," Nina said looking at Brittany, "I heard you sprained your ankle in gym yesterday. Does it still hurt a lot?"

"It's okay as long as I move really slowly," Brittany told her. "We're going to get ice cream at the Just Desserts Shop now. Want to join us?"  "Better not,” Nina said, “ Max is meeting me at home. See you later." 

Nina was taking a short cut through Harborville's city park when she saw Mr. Hansen kneeling beside a new sidewalk. The city maintenance man frowned as she drew closer. "Somebody jumped right in the middle here while the cement was still wet," he said, pointing at two narrow footprints embedded in the concrete. 

"Now I'll have to rip out this section and re-do it. Sure can't leave the sidewalk looking like this!"

"Any idea of who did it?" Nina asked.

"A kid over there on the slide said that girls named Brittany, Mitzi, and Jenny were the only ones near here. But he doesn't know which one ruined my sidewalk."

"I know who did it," Nina declared.

How did Nina figure it out?

#2: There was nothing Leon, the driver, could do about the impending crash of the car he was driving. Leon knew the car would be completely demolished in the crash.  After the crash Leon didn’t have a scratch on him.  How can that be?

                                                    What is Forensic Science
Here is a short video about what a Forensic Scientist does.