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The triple helix model of innovation, as theorized by Etzkowitz and Leydesdorff, is based on the interactions between the three following elements and their associated 'initial role': [9] universities engaging in basic research, industries producing commercial goods and governments that are regulating markets. [2]
The helix of sustainability - the Carbon cycle ideal for manufacture and use The international recycling symbol - not nature identical.. The helix of sustainability is a concept coined to help the manufacturing industry move to more sustainable practices by mapping its models of raw material use and reuse onto those of nature.
As of November 30, 2012, 456 children were enrolled in kindergarten through fourth grade at Sandy Hook Elementary School. [13] The school's security protocols had recently been upgraded, requiring visitors to be individually admitted after visual and identification review by video monitor.
Euclidean space was introduced by ancient Greeks as an abstraction of our physical space. Their great innovation, appearing in Euclid's Elements was to build and prove all geometry by starting from a few very basic properties, which are abstracted from the physical world, and cannot be mathematically proved because of the lack of more basic tools.