Courtney Wilt, 16, of Inverness explains her physics project to her fellow classmates as her project partner Leah Thomas, 16, of Barrington looks on during summer school at Barrington High School.

Mark Welsh | Staff Photographer

Physics students Katie Hoots, 16, of Barrington, right, works on her chemistry project with her project partners Ayesha Arora, 15, middle, and Liesl Helminiak, 15, of Barrington.

Mark Welsh | Staff Photographer

Melanie Kopriva, 17, of Kildeer, left, and Amanda Salter, 17, of Long Grove work with a soil sample in their Advanced Placement environmental science class at Stevenson High School.

Steve Lundy | Staff Photographer

College prep biology teacher Lill Lisius runs her class at Stevenson High School in Lincolnshire.

Steve Lundy | Staff Photographer

Melanie Kopriva, 17, of Kildeer, Denis Serdyukov, 17, of Deerfield and Amanda Salter, 17, of Long Grove work with a soil sample in their Advanced Placement environmental science class at Stevenson High School.

Steve Lundy | Staff Photographer

Katja Sandquist, 17, of Long Grove, left, and Daniel Sagerman, 17, of Buffalo Grove solve problems during an Advanced Placement environmental science class at Stevenson High School.

Steve Lundy | Staff Photographer

Mark Gaughan, left, a senior, Simron Sahoo, a junior, and Danaya Siripun, a senior, look over test results in an Advanced Placement calculus class at Neuqua Valley High School in Naperville.

Bev Horne | Staff Photographer

Bill Yanisch teaches 27 students in an Advanced Placement calculus class at Neuqua Valley High School in Naperville.

Bev Horne | Staff Photographer