Instant Index: Coca-Cola Defends Diet Sodas

Diane Sawyer reports the latest stories that have people buzzing.
1:19 | 08/13/13

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Transcript for Instant Index: Coca-Cola Defends Diet Sodas
We begin our instant index on tuesday night with coca-cola, fighting back. Tomorrow the soft drink giant will publish an ad defending diet sodas, specifically sugar substitutes. Sales have been plummeting as people turn to water and flavored water. The company is on a campaign to reassure people that artificial sweeteners are safe. And have we cracked the code on a happy marriage? The chance impose up if you have a lot of siblings. Four really help. The more brothers and sisters, the more you learn to resolve conflicts and negotiate, and put the cap back on the tooth paste. And a tense moment in the panda cage. Zoo keepers raised a cub separate from its mom, afraid she didn't have a ma tern nature. Then one month later, they bring it back, she licks the baby, seems to want to get close, and the cage door opens, moment of truth -- the baby swept up into the mother's arms, a cradle, and a family is born. Every in taiwan celebrating tonight.

This transcript has been automatically generated and may not be 100% accurate.

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