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.

Dolphins Come When Called, Scientists Say People are not the only geniuses on this planet. Scientists at the University of Saint Andrews in Scotland trailed a pod of dolphins and played a dolphin whistle to see their reaction. One dolphin turned around and swam toward them. When they changed the whistle, a different dolphin turned around. It is proof, scientists say, that dolphins have names and come when called.

Disney World Photobomber Goes Viral It's happened to all of us. Just as you're about to snap that perfect photo, someone steps into the frame. One couple at Disney World was getting engaged when a man walked right in front of the picture perfect shot. The image has now gone viral with that guy being photoshopped into everything including Iwo Jima, the moon landing and the Beatles' walk across Abbey Road. The guy's identity however is still a mystery.

(Courtesy Nick Landis & Erika Boone)