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.

Quality Control Treasury Secretary Jack Lew's infamous loopy signature appears to be undergoing a much-needed makeover. Lew's illegible Slinky-like signature, which will one day grace every U.S. dollar, came under intense scrutiny when President Obama nominated him to lead the Treasury Department.

Lew's old signature is shown on the left. The signature he has developed since taking office as Treasury Secretary is shown on the right.

ABBA Museum Opens The ABBA Museum has opened in Stockholm - complete with a disco floor and a karaoke studio with holograms of the band singing back up.