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."

99-Year-Old Shares Longevity Secret

Jill Leardini reached out to ABC News' David Muir recently on Twitter, saying: "My grandfather is 99 today. Can you believe what he's lived through?" After seeing his youthful picture, "World News" wanted to know his secret so we called the birthday boy Henry Newhard to find out. His answer: "I have a birthday every year. That's the secret." Happy birthday, Henry!