From the unconventional and awe-inspiring to the hilarious and heartwarming, here's a look at some of the most interesting photos, videos and stories that have our newsroom talking today. What's capturing your attention, filling your inbox and cluttering your Facebook/Twitter feed? Tweet us the stories you're talking about using #InstantIndex or email us at ABC.WorldNews@abc.com and they could appear on World News.

Meteor Source Astronomers have calculated the source and size of the Russian meteor. Using dashcam and traffic videos, they were able to determine that the 55-foot rock came from an asteroid belt between Mars and Jupiter.

Presidential Gray In an interview with " Good Morning America" anchor Robin Roberts, first lady Michelle Obama said that President Obama's gray hair wasn't the result of his work. "People think the gray is from his job," she said. "It's from his children."

GoPro Baby Everyone is recording and posting their daredevil adventures - including this little guy. Finn, 14 months old, grabbed his uncle's camera and decided to give us all a tour of his world.