LS2.A: Interdependent Relationships in Ecosystems


In this video Paul Andersen explains the important relationships that exist in ecosystems.  He starts by delineating between organisms and their environment.  He explains how food webs can be used to show energy and matter flow in a community.  He describes the levels studied within ecology and explains how population interact at the level of a community.  He finishes be describing population growth and carrying capacity.

CCC1: Patterns


Paul Andersen explains patterns and describes why pattern recognition is an important skill in science and engineering.  He begins by discussing patterns in nature, including snowflakes, flower petals, seasons and nucleotides in DNA.  He then illustrates the importance of classification in describing and eventually understanding patterns.  He gives a progression instruction in the science classroom from grade K to 12.  A secret pattern is hidden within the video.

SEP6: Constructing Explanations and Designing Solutions


Paul Andersen explains how scientists modify theories by constructing explanations.  He also discusses the cycle of design used by engineers to solve problems.  He starts by defining a theory as a well-established explanation of a phenomenon that is refined over time.  Examples discussed in the video include the big bang theory, the germ theory and the theory of natural selection.  He also lays out a progression for building this skill in students.