The final moments of Friday afternoon are slipping away at Eastern High School in Lansing, Mich., as announcements echo through the halls.
As students stream through the doors, teacher Dee Halstead is rolling her supply cart to the library. Her workday is just ramping up.
"This is my classroom on wheels," Halstead said. "It's my laptop and all of the papers I need to give the students and my flash drive so I can print off this exam."