Transcript for Instant Index: Costco Sued for Bogus Tiffany Rings; Killer Whale Gives Birth
We're going turn to our "instant index" here on a friday night. Tiffany rings that don't come in the trademark blue box. Which one is a real deal and which one is a knockoff? The one to the right is... See More 
This transcript has been automatically generated and may not be 100% accurate.
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International Space Station Cooling System on the Fritz
International Space Station Cooling System on the Fritz
A critical component that keeps the system from dangerously overheating has NASA worried.
Government Shuts Down 52 Bus Lines
Government Shuts Down 52 Bus Lines
Federal regulators are cracking down on safety for bus passengers.
Winter Weather Safety Tips
Winter Weather Safety Tips
Find out how to avoid a trip to the hospital due to slippery ice.
Tea Party Calls Budget Deal a 'Sellout Bill'
Tea Party Calls Budget Deal a 'Sellout Bill'
Many on the far right claim the bill compromises too much.
Nelson Mandela Memorial Service Signer's Mental Health Questioned
Nelson Mandela Memorial Service Signer's Mental Health Questioned
New revelations emerge about his mental state and possible violence in his past.
Bottled Water vs. Tap Water: Can You Tell the Difference?
Bottled Water vs. Tap Water: Can You Tell the Difference?
ABC News' Dr. Richard Besser challenged people to take the water challenge.
Instant Index: 2013 Golden Globe Nominees Announced
Instant Index: 2013 Golden Globe Nominees Announced
Diane Sawyer reveals the stories people have been buzzing about this week.
The Conversation: Opening Up About Death
The Conversation: Opening Up About Death
People share their thoughts and feelings about the end of their lives.
Bitter Cold With Single Digit Wind Chills Across Northern United States
Bitter Cold With Single Digit Wind Chills Across Northern United States
Another possible storm on the way and what to expect as winter packs another punch.
Building a fire with a tire and heating stones were some of the tricks that kept this family going.
Building a fire with a tire and heating stones were some of the tricks that kept this family going.
Building a fire with a tire and heating stones were some of the tricks that kept this family going.
Women Endure Surprising Bias in the Workplace
Women Endure Surprising Bias in the Workplace
When interviewing for a job, men and women might behave the same but get treated differently.
Instant Index: The Great Escape Out of a Bathroom at Work
Instant Index: The Great Escape Out of a Bathroom at Work
Diane Sawyer reveals the stories people have been buzzing about this week.
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