In the depths of the Great Depression Franklin D. Roosevelt’s famously These practices serve several purposes in the Framework. First, they describe the ways in which scientists and engineers go about doing their work. Scientists develop, test, and continually refine explanations of how the natural world works. Engineers use the systematic practice of design to achieve solutions to particular human problems. Second, they describe the ways in which students need to engage to become well prepared for life, work, and citizenship, especially as decisions about the use of technology pervade every aspect of our lives.
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Source : HuffingtonPost.Com