Students in the seventh through 12th grades entered more than 130 projects that were on display last week at the Bay Model in Sausalito during the annual Marin County Secondary Science Fair.

Students developed a hypothesis, tested that hypothesis through data collection and analysis, and then developed conclusions based on their investigations.

The program is coordinated by the Marin County Office of Education.

Grand prize winners were:

Behavioral science: Liza Mansbach, 10th grade, Redwood High School, "The Effect of BMI on Ability to Estimate Calorie Values in Foods."

Engineering science: Conner Addison, 10th grade, Redwood High School, "The Effect of Turbine Blade Design, Angle of Attack and Wind Velocity on Turbine Power and Efficiency."

Environmental science: Kobe Peery, seventh grade, Saint Mark's School, "Do Darker Colors Attract and Sustain More Heat?"

Life science: Anna Knowles and Sarah Melbostad, 12th grade, Sir Francis Drake High School, "Why do Bristlecone Pines Have Twisted Trunks?"

Math and computer science: Parker Snipes, seventh grade, Saint Mark's School, "Probability and Risk."

Physical science: Eric Bryan, 10th grade, Redwood High School, "Harnessing the Power of Anaerobic Redox: The Effect of the Temperature and Electrode Size on the Electrical Production and Growth Rate of the Electrical Production of a Microbial Fuel Cell."

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More than 130 projects judged in annual Marin secondary school science fair