Kaltura Share to Google Classroom Laurie Marshall describes the concept of stability by showing how to balance a teeter-totter. Grades: 6 7 8 9 10 11 12 Subjects: MathAlgebra Collection: Career Explorations!Science, Technology, Engineering, and MathematicsSpanish TranslationsSpanish Captions Series: NASA OnlineNASA CONNECT Math Simulations