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Instant Index: Professor Gets to Bottom of 'Hum' Debacle

David Muir reveals the top stories that have people buzzing this week.
01:13 | 07/27/2013

Transcript for Instant Index: Professor Gets to Bottom of 'Hum' Debacle

Our "instant index" here on saturday, starting with one man's effort to solve a decades-long mystery. You heard this. That amplified recording we let you hear before the break. It's a low-frequency... See More
This transcript has been automatically generated and may not be 100% accurate.
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