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.

Daredevil Scales Tallest Building in China One crazy daredevil took a wild trip up one of China's tallest buildings. He scaled a 900-foot building with no ropes, helmet or net. He only used his bare hands and when he was done, he parachuted back down to the ground.

Powerball Jackpot Rises to $400 Million Powerball fever is taking hold again. In the drawing this weekend, no ticket matched all the numbers, sending the jackpot sky high. It has now ballooned to $400 million, the fourth-largest jackpot ever, and growing. It's been a banner year for big jackpots. In March, a New Jersey native won $338 million. In May, a Florida woman won $590 million and in August, a $448 million jackpot was shared among three lucky winners. The next drawing is Wednesday, leaving you plenty of time to snag a ticket.

Seattle Seahawks Break Guinness World Record for Cheering Some football fans are starting this week a little hoarse after going for the Guinness World Record during Sunday night's Seattle Seahawks vs. San Francisco 49ers game. Thousands of Seahawks fans' cheering clocked in at 136.6 decibels, giving the game the nickname "Deci-Bowl." That's only slightly quieter than a 747 and slightly louder than a thunderclap or a jackhammer. Doctors warn it's enough to cause immediate and permanent hearing damage. Good thing so many fans came prepared with earplugs.

(Otto Greule Jr/Getty Images)