While Robert Hooke discovered the cell in 1665, the first cell theory didn't come about until the 1830s. The video explains the discovery of the cell and the scientists involved. It continues to the parts of cell theory and the...

Robert Koch and his team of scientists identified the germs that cause diphtheria, typhoid, pneumonia, gonorrhea, meningitis, whooping cough, tetanus, plague, leprosy, syphilis, and more—that's some important work! Over a period of 100...

Are superheroes science fiction ... or just really fancy science? Go even further behind the scenes with the characters from Avengers through a video from the American Chemical Society's Reactions playlist. Curious chemists learn the...

Being able to absorb the abilities of other life forms may seem like something taken from a superhero movie, but sometimes reality is stranger than fiction. Join the narrator as he takes viewers back billions of...

Without the cell membrane, our cells just couldn't keep it together! What else does this multifunctional membrane do? Take a deeper look at the fluid mosaic model using a video from an expansive biology playlist. Topics include embedded...

Look here for a narrative approach to cells origins and discovery by microscopes. Though it is a slightly older clip, it contains some lovely footage of cells up close. Begin with prokaryotes and move onto eukaryotes and the differences...

Eukaryotes—were we born from an act of predation that backfired? Ponder this and other questions of evolution with a video from a well-written biology playlist. Topics include the origins of mitochondria and chloroplasts, unusual...

A short video offers a simple, yet engaging, explanation of the theory of evolution using amoebas as an example. The narrator uses the example of the evolution of dog breeds as an example of how humans can influence the course of change.

Where would we be without bacteria? As it turns out, we owe them everything! Introduce young biologists to endosymbiotic theory using an amazing video from an extensive biology playlist. Scholars discover the bacteria that may be...

How did life on earth begin? Is there a scientific explanation that could show how life arose from chemical reactions? Discover the answers to these questions and more as you watch a basic explanation of the hypotheses currently being...

Evolution is a theory but thank goodness gravity is a law. What is the theory of evolution and what are the facts supporting this theory? Here's a short video that explains how fossils, homologous structures, biogeography, and direct...

When will we need to know Einstein's Theory of Relativity in real life? Every single time you use a cell phone, GPS, or watch satellite TV. When a satellite is sent into space without accounting for relativity, problems immediately arise...

If life on Earth began as a prokaryote, how did eukaryotic cells arise? Learners explore the history of endosymbiosis from Dr. Lynn Margulis' first writings, which were not widely received to the evidence of mitochondrial DNA. They then...

The featured movie focuses on the ancestry of our four-footed friends. Find the fundamental pattern of their limbs and vertebrae in fossils of fish. After viewing, biology learners can enjoy interactive websites to zoom in on the...

Insects developed wings and the ability to fly earlier than any other animal—when exactly did that happen? Scientists know this fact but struggle to explain when insect wings developed and how this entirely new structure appeared. PBS...

Do young scientists know that some traits are only passed down by the mother? Mitochondrial DNA is an interesting phenomenon that provides researchers with a lot of useful information. Scholars learn about the endosymbiotic theory, what...

Have researchers found life on another planet? Maybe not, but possibly on one of Saturn's moons! A spacecraft has verified the presence of water on Enceladus as well as other life-supporting compounds. The episode of a solar system...

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.

When is a person no longer living? This question has been puzzled over for millennia, but is there a clear answer? Watch as this video examines the biological line separating life and death.

Although very diverse, Domain Eukarya is the only domain where the organisms are made of eukaryotic cells. The narrator explores the Domain Eukarya. He discusses the characteristics of eukaryotic cells and shows how these evolved over...

A hypnagogic jerk, or hypnic jerk, is when you startle yourself awake just as you are drifting off to sleep. The video describes what a hypnic jerk is, how common they are, and who typically experience them. Viewers are offered two...

Young biologists explore the theories of DNA replication, learning about the Meselson-Stahl experiment and how it proved DNA replication through semiconservative replication. The video reviews the parts of DNA and then delves...

An informative video explains viruses' genetic information and their protein coats as well as the envelopes that allow entry into host cells. 

Consider a question that baffles even scientists. Why are leaves green? The video lesson offers a theory that begins with the first aquatic plants. Learners consider alternative explanations as well.