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3-2-1 Contact (1980) : Crowded/Uncrowded: Human Survival/Controlling Densities

REHASHED FROM PREVIOUS FOUR EPISODES: Lisa rides a hot-air balloon. FILM INSERT: The elephant struggles for survival in Africa. ADDITIONAL: The black hole.

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Noisy/Quiet: Production & Processing of Sound January 14, 1980
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Noisy/Quiet: The Ear January 15, 1980
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Noisy/Quiet: How People & Animals Use Sound January 16, 1980
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Noisy/Quiet: Music January 17, 1980
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Noisy/Quiet: Range of Vibration January 18, 1980
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Forces and Motion March 24, 1980
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Forces and Fields March 25, 1980
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Forces: Buoyancy and Gravity March 26, 1980
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Forces and Machines March 27, 1980
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Forces: A Spectacle of Forces March 28, 1980
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Growth/Decay: Sex and Seeds March 10, 1980
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Growth/Decay: Human Growth March 11, 1980
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Growth/Decay: Decay March 12, 1980
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Growth/Decay: Human Cultures/Land Forms March 13, 1980
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Growth/Decay: Cycles Upon Cycles March 14, 1980
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Fast/Slow: Speed Up, Slow Down January 28, 1980
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Fast/Slow: Rhythms of Nature January 29, 1980
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Fast/Slow: Lifetimes January 30, 1980
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Fast/Slow: Speed and Racing February 07, 1980
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Fast/Slow: Time and Time Again February 01, 1980
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Communication: Human Communication March 17, 1980
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Communication: Animal Communication March 18, 1980
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Communication: Machinery of Communication March 19, 1980
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Communication with Other Species March 20, 1980
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Communication: Feedback March 21, 1980
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Food/Fuel: Animal Food February 04, 1980
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Food/Fuel: Human Food February 05, 1980
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Food/Fuel: Growing and Processing Food February 06, 1980
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Food/Fuel: Fueling Machines February 07, 1980
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Food/Fuel: The Sun Makes Everything Go February 08, 1980
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Hot/Cold: People's Temperatures January 21, 1980
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Hot/Cold: Animal and Plant Adaptations January 22, 1980
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Hot/Cold: How Hot or Cold Can It Get? January 23, 1980
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Hot/Cold: Heat and Work January 24, 1980
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Hot/Cold: Temperatures on Earth/In Space January 25, 1980
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Light/Dark: The Sun February 18, 1980
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Light/Dark: Electromagnetic Spectrum February 20, 1980
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Light/Dark: The Eye February 21, 1980
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Light/Dark: Light Sources February 22, 1980
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Near/Far: Seeing Isn't Always Believing March 03, 1980
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Near/Far: Mapping and Navigating Near Home March 04, 1980
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Near/Far: Mapping and Navigating Over Earth March 05, 1980
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Near/Far: Space Travel March 06, 1980
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Near/Far: Knowing Where You Are March 07, 1980
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Order/Disorder: Regular Patterns March 31, 1980
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Order/Disorder: The Body â€“ An Ordered System April 01, 1980
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Order/Disorder: Social Order April 02, 1980
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Order/Disorder: Disordered April 03, 1980
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Order/Disorder: Sum of Its Parts April 04, 1980
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Surfaces: Protection April 07, 1980
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Surfaces: Shapes and Functions at the Surface April 08, 1980
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Surfaces: Surface Tension and Bubbles April 09, 1980
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Surfaces: Surface of the Earth April 10, 1980
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Surfaces: The Atmosphere April 11, 1980
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Big/Small: Animal Sizes/Scaling February 25, 1980
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Big/Small: Animal Habitats February 26, 1980
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Big/Small: Dinoaurs February 27, 1980
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Big/Small: Volume & Efficiency February 28, 1980
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Big/Small: How Big is Big? February 29, 1980
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Crowded/Uncrowded: Human Crowding February 11, 1980
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Crowded/Uncrowded: Optimum Populations in Nature February 12, 1980
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Crowded/Uncrowded: Contrasts in Densities of Materials February 13, 1980
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Crowded/Uncrowded: Down Among the Atoms (Liquids & Solids) February 14, 1980
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Crowded/Uncrowded: Human Survival/Controlling Densities February 15, 1980