Video Description:  At NASA everything begins with an idea. Physical models help NASA engineers and technicians test those ideas before building full-scale versions. Learn more about the important role physical modeling, building prototypes and mathematics play in engineering solutions.  Video Length:  3:11.NASA eClipsTM is a suite of online student-centered, standards-based resources that support instruction by increasing STEM literacy in formal and nonformal settings.  These free digital and downloadable resources inform and engage students through NASA-inspired, real-world connections.NASA eClips Real World segments (grades 6-8) connect classroom mathematics to 21st Century careers and innovations.  They are designed for students to develop an appreciation for mathematics through real-world problem solving.