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Habitable Planet, Unit 8, Water Resources
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 8 (District of Columbia: Annenberg Learner, 2007), 28 mins

Earth's water resources, including rivers, lakes, oceans, and underground aquifers, are under stress in many regions. Humans need water for drinking, sanitation, agriculture, and industry; and contaminated water can spread illnesses and disease vectors, so clean water is both an environmental and a public health i...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 8 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Chemistry: Challenges and Solutions, Unit 3, Atoms and Light
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presented by Michael C. McCarthy, fl. 1997; produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 3 (District of Columbia: Annenberg Learner, 2014), 28 mins

As the 20th century approached, scientists moved beyond the idea of the atom as indivisible by identifying its interior components: the electron (Thompson, 1897), the proton (Rutherford, 1920), and the neutron (Chadwick, 1932). The Bohr model (1913) of the atom added detail to the picture, describing how electrons...

presented by Michael C. McCarthy, fl. 1997; produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 3 (District of Columbia: Annenberg Learner, 2014), 28 mins
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Physics for the 21st Century, Unit 2, Unit 2: The Fundamental Interactions
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 2 (District of Columbia: Annenberg Learner, 2010), 28 mins

This unit takes the story of the basic constituents of matter beyond the fundamental particles that we encountered in unit 1. It focuses on the interactions that hold those particles together or tear them asunder. Many of the forces responsible for those interactions are basically the same even though they manifes...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 2 (District of Columbia: Annenberg Learner, 2010), 28 mins
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Physics for the 21st Century, Unit 6, Unit 6: Macroscopic Quantum Mechanics
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produced by Alex Griswold, fl. 1982 and Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 6 (District of Columbia: Annenberg Learner, 2010), 28 mins

The fundamentals of quantum mechanics that we met in Unit 5 characteristically appear on microscopic scales. Macroscopic quantum systems in which liquids, or electric currents, flow without friction or resistance have been known since the early part of the previous century: these are the superfluids and supercondu...

produced by Alex Griswold, fl. 1982 and Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 6 (District of Columbia: Annenberg Learner, 2010), 28 mins
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Physics for the 21st Century, Unit 9, Unit 9: Biophysics
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 9 (District of Columbia: Annenberg Learner, 2010), 28 mins

Following the example set in the previous unit, we now attempt to bring principles of physics to bear on the most complex systems of all: biological systems. Is it possible to describe living systems, or even small pieces of living systems, with the same concepts developed elsewhere in our ramble through physics?...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 9 (District of Columbia: Annenberg Learner, 2010), 28 mins
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Physics for the 21st Century, Unit 11, Unit 11: Dark Energy
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 11 (District of Columbia: Annenberg Learner, 2010), 28 mins

This unit focuses on one of the biggest questions in 21st century physics: what is the fate of the universe? In recent years, astronomers have been surprised to discover that the expansion of the universe is speeding up. We attribute this to the influence of a "dark energy" that may have its origin in the microsco...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Physics for the 21st Century, Unit 11 (District of Columbia: Annenberg Learner, 2010), 28 mins
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Chemistry: Challenges and Solutions, Unit 4, Organizing Atoms and Electrons
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presented by Mala Radhakrishnan, 1978-; produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 4 (District of Columbia: Annenberg Learner, 2014), 28 mins

Before scientists knew about the subcomponents of atoms, they organized elements based on physical and chemical properties. Dmitri Mendeleev developed an early Periodic Table of the 63 known elements, leaving gaps for the discovery of new elements to come. His table was enhanced by Henry Moseley who enabled today'...

presented by Mala Radhakrishnan, 1978-; produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 4 (District of Columbia: Annenberg Learner, 2014), 28 mins
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Chemistry: Challenges and Solutions, Unit 13, Modern Materials and the Solid State
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presented by Ainissa Ramirez, 1969-; produced by Alex Griswold, fl. 1982 and Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 13 (District of Columbia: Annenberg Learner, 2014), 28 mins

In this unit, the focus shifts from fluids and their solutions to solids, whose atoms and molecules are fixed in definite arrangements. Examples of molecular configurations range from crystals in a mineral collection, to metal alloys, to long polymer chains. One promising area of polymer research may allow the del...

presented by Ainissa Ramirez, 1969-; produced by Alex Griswold, fl. 1982 and Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Chemistry: Challenges and Solutions, Unit 13 (District of Columbia: Annenberg Learner, 2014), 28 mins
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Habitable Planet, Unit 5, Human Population Dynamics
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 5 (District of Columbia: Annenberg Learner, 2007), 28 mins

What factors influence human population growth trends most strongly, and how does population growth or decline impact the environment? Does urbanization threaten our quality of life or offer a pathway to better living conditions? What are the social implications of an aging world population? Discover how demograph...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 5 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 6, Risk, Exposure, and Health
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 6 (District of Columbia: Annenberg Learner, 2007), 28 mins

We are exposed to numerous chemicals every day from environmental sources such as air and water pollution, pesticides, cleaning products, and food additives. Some of these chemicals are threats to human health, but tracing exposures and determining what levels of risk they pose is a painstaking process. How do har...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 6 (District of Columbia: Annenberg Learner, 2007), 28 mins
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