Paul Andersen introduces electric charges. The amount of charge in a system is conserved but individual charges can move through a conductor as current. [4:19]

Find out how a system can be viewed as an object and an object can be viewed as a system. [4:10]

Paul Andersen explains the differences between a system and an object as it relates to physics. [4:50]

Mr. Andersen illustrates and explains how all objects contain positive and negative charge. [5:24]

Paul Andersen explains pH as the power of hydrogen. He explains how increases in the hydronium ion (or hydrogen ion) concentration can lower the pH and create acids. He also explains how the reverse is true. An analysis of a strong acid and strong base is also included. [8:53]

In this video Paul Andersen explains how the activation energy is a measure of the amount of energy required for a chemical reaction to occur. Due to the collision theory the activation energy requires proper energy and orientation of the colliding molecules. Do not miss the additional resources. [4:52]

Paul Andersen explains important concepts that can not be explained by simple Mendelian genetics. He begins with a discussion of polygenic inheritance and uses a simulation on height to show how a bell shape curve of phenotypes is produced. [12:12]

Paul Andersen describes the pros and cons of industrial agriculture including: monocropping, irrigation, and the use of pesticides, fertilizers, and GMOs. [9:25]

Paul Andersen explains how air pollution refers to any chemicals in the atmosphere that negatively affect human health. Primary and secondary pollutants are included. [9:25]

Paul Andersen introduces Anatomy and Physiology in this podcast. He starts by describing how the form of an object fits the function. He then explains the themes of homeostasis and hierarchy. He describes the four major types of tissues; epithelial, muscle, nervous and connective. [11:25]

Video [7:28] in which Paul Andersen explains in a clear and understandable way, that rotating objects have angular momentum.

Paul Andersen explains how asking questions is the first step in both science and engineering. Questions allow scientists to direct inquiry with a goal of understanding the phenomena in the Universe. Questions allow engineers to define problems that require solutions. [8:23]

Paul Andersen explains how the behavior of various organisms is shaped by natural selection. The action of phototropism and the timing of photoperiodism have both been shaped by the relative availability of light. Courtship in the bower bird determines the success of offspring. [9:02]

Paul Andersen explains the importance of biodiversity. He starts by describing how biodiversity can be species, genetic, or ecosystem diversity. He explains the importance of keystone species in an environment and gives two examples; the jaguar and the sea otter. He finishes with a quote from the father of biodiversity, E.O. Wilson. Includes PDF file with review questions. [7:34]

In this video, Paul Andersen defines biodiversity and explains the impacts humans are having on the planet's biodiversity. Humans are impacting the variety of life on our planet through habitat destruction, invasive species, pollution, overpopulation, overexploitation and climate change. A K-12 teaching progression is also included. [5:55]

Paul Andersen explains how biogeochemical cycling is used to move nutrients from the environment into living material and back again. He explains the water cycle, the carbon cycle, the nitrogen cycle and the phosphorus cycle. He also explains the CHNOPS mnemonic device. He also explains why organisms need carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur. [10:07]

In this video, Paul Andersen explains the topic of biogeology. Life only exists where the geosphere, hydrosphere and atmosphere allow life to exist. The interactions between the organisms on the planet and the planet itself is known as biogeology. As the landforms on the planet change the lifeforms adapt through evolution. [4:51]

In the following video Paul Andersen explains how you can use Coulomb's Law to determine the electric force between two charges. [6:50]

Paul Andersen describes the history of calorimetry and explains how it can be used to measure energy changes in a system. The specific heat of water is well established and so as a system releases or absorbs energy from a surrounding water bath it can be measured. [6:01]