LS4.A: Evidence of Common Ancestry and Diversity


In this video Paul Andersen describes several types of evidence for common ancestry.  This evidence is contained in the fossils, embryos and molecules of living organisms.  Even though life on our planet is incredibly diverse there are common threads that run through everything.  This idea was most elegantly put forward by Charles Darwin before much of this evidence was gathered.  A teaching progression K-12 is also included.

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.