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Instant Index: Proof Dolphins Are Highly Intelligent

Diane Sawyer reveals the top stories people have been buzzing about this week.
01:29 | 07/23/2013

Transcript for Instant Index: Proof Dolphins Are Highly Intelligent

Our "instant index" starts with a reminder we are not the only living things on earth with names. Scientists recorded the sound of one dolphin, then traveled out into the water and played it back.... See More
This transcript has been automatically generated and may not be 100% accurate.
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