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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Jackie Kennedy's Letters Pulled From Auction Explosive secret letters from Jacqueline Kennedy were set to go on auction, but reports surfaced that they have been pulled after the Kennedy family, including daughter Caroline, intervened. The former first lady wrote to her Catholic priest, Father Joseph Leonard, a priest at All Hallows College in Dublin, for 14 years until the priest's death in 1964. The correspondence revealed her private thoughts on her husband and their marriage. The letters were set to be auctioned on June 10 and had been expected to earn up to $5 million, but the future of the letters is now unclear.

One-Way Trip to Mars How does a one-way ticket to Mars sound? To 200,000 people, it sounded like the trip of a lifetime. A nonprofit in the Netherlands, Mars One, plans to send four people to Mars in 2024. Nearly 200,000 people applied for the slots. Their mission? To set up the first human civilization on Mars. The only trouble is, there's no way to get back to Earth.

Moonwalk 2.0 One teen took Michael Jackson's moonwalk to a whole new level. Brett Nichols, 17, of Turlock, California, became an internet sensation after performing Michael Jackson's "Billie Jean" at his high school's talent show. Nichols told ABC News affiliate KXTV: "It inspired me, and then I thought, 'Why isn't this something I can't do?' Then it was practice, practice, watch, learn and take notes." The video has nearly 5 million hits on YouTube. Needless to say, Nichols won the talent show.