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Informal education  
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Nondestructive Evaluation (NDE) is the process of evaluating materials to detect and measure the presence of defects without causing damage to the material being tested. In this lesson, middle and high school students are introduced to NDE,... (View More)

The Picture Post Network involves individuals, schools, organizations and communities in a systematic monitoring project of their local environment, especially vegetation health. Digital photographs - taken from the same location and positioned in... (View More)

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