Howard Hughes Medical Institute
Development of the Human Embryonic Brain
Viewers follow the development of a human embryo, the brain, and the number of neurons at each stage. They learn when the brain stops growing and the importance of neural connectivity.
Howard Hughes Medical Institute
Molecular Activity in Aplysia Long-Term Memory
How does information move into long-term memory? Scholars view the process at the molecular level with an animation. They learn about synaptic growth and how specific genes become active.
Mathispower4u
Writing Variable Expressions (Examples)
Variables are the name of the game. The video instructor explains the importance of defining a variable and then models how to write an expression. He reviews three different problem scenarios and then builds expressions to model each...
Mathispower4u
Write Algebraic Expressions (Example)
Expressing words as numbers and symbols ... that is the task at hand. Given a contextual situation, it is often necessary to rewrite the information as expressions. The video demonstration shows two examples of this concept and gives...
Howard Hughes Medical Institute
Signal Molecules Trigger Transcription Factors
How do transcription factors change the function of a cell? Learn how three similar cells find different functions based on their locations and the number of triggers available. Observe an animation of the process of assigning a trait...
Howard Hughes Medical Institute
Antigen Presentation and CTL
How does your body know when to present an immune response? Viewers observe how antigen presentation triggers the response and how this treatment helps attack viruses before they spread. The video also discusses the challenges of...
Howard Hughes Medical Institute
Creating Embryonic Stem Cell Lines
Even today's stem cells have a history—and it's more than 30 years old! Learn how stem cell lines grow in a lab. Observe the various experiments completed to determine how cells grow in human embryos.
Howard Hughes Medical Institute
Zebrafish Heart Regeneration
Zebrafish find popularity among aquarium owners for their beauty and biologists for their unique abilities. Biologists discovered zebrafish have the ability to regenerate damaged hearts. Use the video to observe and understand this...
Mathispower4u
Write Algebraic Expressions from Statements: Form ax+b and a(x+b)
Write an expression from an expression, verbal to algebraic. A quick video lesson gives pointers on how to write algebraic expressions from words. Stressing important vocabulary and order of the expression help to develop an...
Mathispower4u
Write Basic Expressions from Words Modeling Situations
Writing expressions is a basic skill of algebra—but it's a skill that causes scholars to struggle. A thorough video provides examples and explanations to help individuals understand the process. From defining the variable to representing...
Mathispower4u
Writing Basic Algebraic Expressions (Example 1)
Turning words into symbols, a powerful application of mathematics. A video lesson explains how to rewrite a problem-solving question with expressions. The instructor emphasizes the need to define variables.
Mathispower4u
Write Expressions and Determine the Measure of Complementary Angles (Example)
Investigate algebraic applications of complementary angles. Young scholars watch as the instructor describes and defines complementary angles. He then shows an example of finding an unknown value of x given expressions for a pair of...
Mathispower4u
Write Expressions for Complementary Angles and Supplementary Angles (Basic) (Example)
A straightforward lesson explains the meaning of complementary and supplementary angles. The instructor uses both an algebraic representation and a numeric example to describe each angle pair.
Mathispower4u
Writing Expressions to Solve a Linear Equation App: Stamps
Learners build skills for writing and solving equations with a video that describes the process for writing expressions and then an equation to solve a problem. The problem asks for the number of nickels and dimes needed given a set of...
Domain of Science
The Chain of Life
The narrator of a short animated video asks viewers to consider how they are just one link in a great chain of life that extends all the way back through time to the first single-cell organisms.
Domain of Science
The Map of Biology
Many define biology as the study of life but can't agree on a definition of life. Trying to explain all of the domains and subdomains of biology seems a bit easier than defining life. See a full map of the topics covered by the general...
Howard Hughes Medical Institute
Repellant Ephrin Signals Guide Limb Innervations
The foot bone connects to the leg bone, but how? Learn about how neurons grow in the proper direction thanks to signalling. Observe what happens when they encounter a repulsive ephrin signal and the correction process that takes place.
Howard Hughes Medical Institute
HIV Life Cycle
Almost half of the global population infected with HIV cannot afford treatment. To better understand this devastating disease, young scientists observe the life cycle of HIV. Through animation, they see the cell infection,...
Howard Hughes Medical Institute
Protease Inhibitors
Protease inhibitors currently treat HIV and hepatitis C, but in the future, might also be used to treat some cancers. Viewers learn how HIV spreads in the body and then observe what happens after the introduction of a protease...
Howard Hughes Medical Institute
U.S. AIDS Epidemic
The first AIDS cases in the United States were reported in June of 1981. AIDS quickly became an epidemic soon and the lack of a treatment or cure caused fear in the entire population. Viewers observe a geographical representation of the...
Howard Hughes Medical Institute
AZT Blocks Reverse Transcriptase
AZT, developed in the 1960s to treat cancer, actually treats HIV as well. Viewers observe how AZT blocks the reverse transcriptase of HIV. Then they see what happens when the virus mutates to be immune to AZT.
Howard Hughes Medical Institute
Human Embryonic Development
At what point in the fertilization process do stem cells turn into an embryo? Viewers observe the development of an embryo from egg to fertilization to development into a fetus. The narrator stresses the role of cell division,...
Howard Hughes Medical Institute
Cytoplasmic Factors
Cell division, cell expansion, and cell growth all take place in the cytoplasm exclusively. Young biologists learn about the role of cytoplasmic factors in cell development through and animated video.
PBS
Clouds and Weather
The sun heats Earth's surface unevenly, causing crazy weather patterns around the globe. A NOVA video describes the resulting changes in air pressure, temperature, humidity and their impacts on weather. It connects the concepts to...