In the following video Paul Andersen explains how a radioactive nuclei can decay by releasing an alpha, beta, or gamma particle. The exact moment of decay for each nuclei can not be determined but probability is useful in predicting the half-life. [7:42]

In the following video Paul Andersen explains how heat is the movement of energy from an object with a higher temperature to an object with lower temperature. Heat transfer can occur through conduction, convection, and radiation. [4:10]

In the following video Paul Andersen explains how energy can be transferred from warmer objects to colder objects through heat. Temperature is a measure of the average kinetic energy of the particles in a substance. When two objects are in contact collisions between the particles will transfer energy from the warmer object in the form of heat. [5:05]

In the following video Paul Andersen explains how heating is the transfer of energy (heat) from a warmer object to a cooler object. Heat can be transferred through conduction, convection and radiation. At the microscopic level conduction results from the collision of particles and therefore the transfer of kinetic energy. [3:32]

Paul Andersen explains how hugs between tissues can help maintain homeostasis. Countercurrent heat exchange allows heat to stay within the core of the body. Close contacts between the capillaries and alveoli allow our body to maintain the correct concentration of oxygen. Capillaries also hug the tubules in the nephron to maintain osmolarity and filter the blood. [8:34]

Paul Andersen explores population dynamics of the human population. The population has show exponential growth since the industrial revolution and all countries will eventually move through the demographic transition. [11:14]

Paul Andersen talks about the impacts of human growth on the environment and on themselves. The population, affluence, and destructive technology of a population impact the environment according to the IPAT equation. An analogous model is the ecological footprint which increases with the development of a nation. Be sure to check out the additional resources provided. [8:47]

Paul Andersen explains how the world population has undergone exponential growth since the industrial revolution. Predicting the future world population is difficult because each country will grow at different rates. Age-structure diagrams and the demographic transition model can allow countries to plan for future growth. [10:18]

In the following video Paul Andersen explains how the pressure, volume, amount, and temperature of an ideal gas are related. Absolute zero of a gas can be determined by varying the temperature and measuring the corresponding volume of a gas sample. Several examples including Boyle's and Charle's Law are included. [5:35]

Paul Andersen explains how your body protects itself from invading viruses and bacteria. He starts by describing the nonspecific immune responses of skin and inflammation. He then explains how we use antibodies to disrupt the function of antigens and mark them for destruction. [13:46]

In the following video Paul Andersen defines impulse as the product of the force applied and the time over which the force is applied. The impulse of an object is equivalent to the change in momentum of the object. [9:11]

Paul Andersen explains how inertial mass is defined and measured in context of Newton's second law of motion. [4:30]

How and why do organisms interact with their environment and what are the effects of these interactions? [8:13]

In the following video Paul Andersen explains how the kinetic energy of an object if due to the motion of an object. Objects can have kinetic energy but they cannot have potential energy unless they are part of a system. [4:47]

In this video Paul Andersen explains how a spontaneous process may take either the thermodynamically controlled or the kinetic controlled pathway. If the activation energy determines the path taken then the process is under kinetic control. This accounts for the variation if products from a similar reaction at different temperatures. Find extra slideshow and map resources. [4:24]

In the following video Paul Andersen explains how the energy in a closed system can be converted from kinetic to potential to kinetic energy. Sample problems and a simulation is contained. [4:46]

Paul Andersen explains how land is developed for human use. Urbanization has occurred through the last century as people have moved to cities in large numbers. Transportation and the arrival of the car have led to urban sprawl and urban blight. [8:07]

Mr. Andersen explains the law of superposition and the principle of original horizontality. He uses an animation to explain how rock layers can accumulate over time. [6:21]

In the following video Paul Andersen explains how light can be absorbed, reflected, or transmitted as it moves from one medium to another. The reflection of different wavelengths creates the perceived color of an object. Absorbed light is converted to energy and transmitted light moves through the material. [4:55]

The following video explains how all material has magnetic properties. Ferromagnetic material can be permanently magnetized, paramagnetic material will align with magnetic fields, and diamagnetic material will align weakly with magnetic fields. Magnetism is a quantum property that acts at all scale levels. [6:47]