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The Mole
One of the most important concepts to master in an introductory chemistry course is the concept of the mole, which provides chemists with a way to "count" atoms and molecules. Learn how scientists use the mole and explore the quantitative definition of this basic unit.
Diagnosis: Unknown - Season 2
Medicine is a battle that is fought every day, in every corner of America, and all around the world. It is a fight against the ultimate villain, death, and it is waged heroically by men and women who live their lives by one profound oath: "I will do no harm."…
Diagnosis: Unknown - Season 1
Medicine is a battle that is fought every day, in every corner of America, and all around the world. It is a fight against the ultimate villain, death, and it is waged heroically by men and women who live their lives by one profound oath: "I will do no harm."…
The SI (Metric) System of Measurement
Next, you continue to lay a strong foundation for your understanding of chemistry by learning about one of the key tools you'll be using: the International System of Units (SI), or the metric system. This lecture explains why this system is so useful to scientists and lays out the prefixes…
Penicillin: The Magic Bullet
In the late 1920's, Alexander Fleming worked on a mould called penicillium and its ability to attack bacteria. But his laboratory notes reveal that he abandoned work on the substance convinced it would never work in living tissue. Ten years later, Australian Howard Florey found Fleming's article and hand picked…
Sasha Ivanochko
Part of the Series: Freedom
Sasha Ivanochko landed in dance after successfully representing Canada on the international stage in gymnastics. In a recent Globe and Mail article celebrating the "Top 133 Young Canadians" of the new millennium, she was described as "one of the powerhouses of the Toronto Dance Theatre and regarded as a stellar…
The Science of Energy - Resources and Power Explained
Energy is, without a doubt, the very foundation of the universe. It's the engine that powers life and fuels the evolution of human civilization. Yet for all its importance, what energy really is and how it works remains a mystery to most non-scientists. For example:
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Under Our Skin - The Untold Story of Lyme Disease
Part of the Series: Under Our Skin Collection
A chilling tale of microbes, medicine and money, this Oscar shortlisted film has changed the landscape of the Lyme epidemic, bringing unprecedented awareness in an engaging and accessible way. The definitive record of the Lyme controversy, Under Our Skin exposes a hidden story of medical and scientific malfeasance and neglect.…
Body Wars - The Epidemic of Autoimmune Diseases.
Something frightening is happening to the citizens of the developed world. Despite major advances in health care, over recent decades we've been battling an ever-growing epidemic of once rare allergic and autoimmune diseases. Today, more than 17 million people in the U.S. alone struggle to maintain one of their body's…
Strong Acids and Bases—General Properties
You return to the topic of pH and learn about how pH relates to two kinds of compounds: acids and bases. Through an introductory problem, you explore the relationship of various ions within these compounds.
Ions, Compounds, and Interpreting Formulas
Learn about protons, electrons, and neutrons; how ions are formed from atoms; how these ions can combine to form compounds; and how you can determine the formulas of these compounds. Some molecular substances are discussed and you are introduced to the final number associated with every element--its atomic weight.
The Path to Nuclear Fission - The Story of Lise Meitner and Otto Hahn
The story of two close friends who discovered nuclear fission is told in great detail within the context of both World Wars. This video is as much about role of scientists in political events, social responsibility, and discrimination against women and Jews, as it is about the science, though the…