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piaget- preoperational stage
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Duration: 03:11
Category: Howto
Thirsty? So is everyone else. We're headed for a water shortage. Here's how simple daily choices ...
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Duration: 01:44
Category: Nonprofit
Protect your own acre now www.conservation.org Harrison Ford demonstrates -in a personal way- the ...
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Duration: 00:35
Category: Nonprofit
A four year and seven year old engaging in classic Piagetian conservation tasks (4 minutes).
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Duration: 04:47
Category: People
Renewable energy technologies have come a long way. But public attitudes lag far behind.
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Duration: 03:03
Category: Nonprofit
Using the law of conservation of energy to see how potential energy is converted into kinetic energy
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Duration: 10:06
Category: Education
Conservation! is an experimental video and animation composite focusing on the topic of ...
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Duration: 03:01
Category: People
thesca.org The Student Conservation Association (SCA) is a nonprofit organization that offers ...
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Duration: 05:38
Category: Nonprofit
Coral reef conservation field work by Dr. Stuart Sandin, Scripps Institution of Oceanography at UC ...
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Duration: 02:57
Category: Tech
Wildlife is endangered by human activities as never before and species extinctions threatens the ...
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Duration: 29:55
Category: Education
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Duration: 03:11
Category: Education
Angular momentum is constant when there is no net torque.
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Duration: 10:12
Category: Education
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