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.

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Saatchi Files for Divorce

Charles Saatchi, 70, - husband of celebrity chef Nigella Lawson, 53, - is filing for divorce. The development comes on the heels of headline-grabbing photographs that showed Saatchi with his hands around Lawson's throat. According to the Daily Mail, Saatchi says Lawson failed to defend him and his reputation after the images went viral and sparked a firestorm. "I wish Nigella only the best for her future, and for her continuing global success. She remains the most wonderful woman in the world. I feel very fortunate to have had such a lovely wife for many years," he said, according to the Mail.

Randy Travis Hospitalized

Country superstar Randy Travis, 54, is in critical condition in a Texas hospital after being admitted on Sunday. The singer reportedly was suffering complications from viral cardiomyopathy - a weakening of the heart muscles caused by a viral infection. Travis was hospitalized in 2012 after a fight near a church in Plano, Texas.

Polar Bear Meets Cruise Ship

On Sunday, A young polar bear had a close encounter with a M/S Expedition cruise ship near the Norwegian islands of Svalbard. Tourists aboard photographed the cub standing on his hind legs pushing up against the side of the ship - a kind of polar "who's there?" Curiosity satisfied, the bear was later seen standing on his hind legs watching as the ship left its territory.