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

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

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

by ABC News Videos 1:13 mins

David Muir reveals the top stories that have people buzzing this week.

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