Our World: Changing Theories - The Scientific Method in Action

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Uploaded by on Dec 14, 2009

See how scientists develop ideas about the universe, then set out to prove what they think is right. Often this search leads to new questions and new discoveries. Find out how the Mars Phoenix Lander has changed what NASA scientists believe about Mars.

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  • this video should have 1,000,000 views..

  • Nice video.

    But I think there should be some emphasis on the difference between a "hypothesis" and a "theory".

    The title of this video used the word "theory", but the video itself talks about "hypothesis".

    Many people don't understand the definition of the term "theory" in science, and use this term to attack the theory of evolution.

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