Harboring resentment against others is just as real to your body as a dangerous situation and can invoke a fight or flight response. The video explores the fight or flight response in humans. Viewers see what is happening inside the...

Humans have taken communication to every corner of the Earth, yet our bodies, at the cellular level, have communicated without technology for millions of years. Learners view the variety of ways cells can communicate, whether right...

It is hard to believe a 300-foot-tall Redwood tree began as a single cell hundreds of years ago. How did it grow so large? Observe how different kinds of cells (bacteria, sex cells, and eukaryotic cells) reproduce or make more cells...

Climate change has happened throughout the history of the planet, and the video uses examples from continental drift to modern airplanes as measurable examples. It begins with how climate change will impact systems on the...

To take one step, the body uses about 200 muscles. In the video, learners see the difference between the three types of muscles found in the human body—skeletal/striated, smooth, and cardiac. The instructor then explains, in detail, how...

Embryonic stems cells were only first discovered in 1998 — less than 20 years ago. The video explains what stem cells are (both pluripotent and totipotent), how they become specific types of tissues cells via internal cues such as the...

Did you know that arctic hare have black eyelashes that protect their eyes from the sun? Scholars learn how genotypes are either expressed or not, based on environmental factors. The narrator explores how the Himalayan rabbit, the...

Because salmon live both in salt and freshwater, they have physical (different urine concentrations) and behavioral (drinking more or less water) adaptations to maintain osmolality. In this osmoregulation video, the instructor...

Many processes in the universe are either too small and fast or too large and slow to easily observe. The third concept in the Next Generation Science Standards addresses this with lessons on scale, proportion, and quantity. A video...

Scholars analyze Morgan's fruit fly lab to learn how genes are linked. The instructor shows that the data from a dihybrid cross was not what Morgan expected, and when re-crossed numerous times, the data did not change. Viewers see gene...

Adults' bodies are made of 206 bones, whereas babies have about 300 different bones or areas of cartilage. Pupils explore the difference between exo- and endo- skeletons in a video about the skeletal system. They then see how bones are...

What is more important, style or substance? This video explains the difference between physical (style) changes and chemical (substance) changes. It uses many examples and various ways of determining which type of change has occurred. 

The average person's heart beats about three billion times during their lifetime. In this circulatory system video, learners briefly see the difference between an open and closed circulatory system. The rest of the video focuses on the...

Between 1968 and 2002, the total number of peppered moths decreased by almost two thirds, although scientists do now know why. In the 10th video of the series, the instructor defines evolution as any changes to a gene pool. Scholars then...

Complete heterochromia is a mutation that causes a person to have two different colored eyes. Class members explore how genotypes affect phenotypes. The instructor shows how changes in DNA can occur via mistakes in replication,...

Hey, crank up the thermostat, my computer froze again! In a thermoregulation video, learners see how organisms either maintain their body temperatures or do not. The instructor explains the difference between conduction, convection,...

This resource must have a greater concentration of hydroxide ions than hydrogen ions because it makes pH seem basic. The video describes what happens on a molecular level to change the pH of a liquid and focuses on the importance of...

An informative video goes in depth about lipids, or fats. It describes the importance of cell membranes and hydrocarbon tails that contain the energy available for life. It also explains the construction of phospholipids and...

Toxins, poisons, and diseases, oh my! These forces work throughout the body to disrupt the normal processes causing harm, or even death. Learners see how toxins, poisons such as anthrax, and diseases such as diabetes affect the normal...

You slough off all your skin cells once every seven years. Thank goodness for mitosis, or we would all be looking pretty strange without skin. The video begins by reviewing the cell cycle, looks at an overview of cells undergoing...