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."

Facebook to Buy WhatsApp for $19 Billion Facebook is buying mobile messaging service WhatsApp for a potential $19 billion. It is the company's biggest acquisition ever. WhatsApp allows you to text anywhere in the world for free. The company has 55 employees and by our math, Facebook will pay $345 million for each employee.

(Credit: Matt Rourke/AP Photo)

People Are Most Happy in the Morning, Researchers Say Researchers from Cornell tracked the tweets of 2.5 million people and found that we are most likely to feel happy when we first wake up in the morning. This is likely thanks to the joy of a good night's sleep. Our moods appear to get darker as the day ticks by but don't blame your job, the same thing happens on the weekends.

Would You Give a Shivering Child the Coat Off Your Back? A new campaign by a charity is hoping to inspire us all to donate to children around the world, especially children in Syria. The charity had a young boy stand outside alone in the cold without a coat. Cameras were rolling as one person after another offered him gloves, a scarf and the coat off their back.

Nestle Recalls Two Types of Hot Pockets Nestle, the maker of Hot Pockets, is recalling two types of the meat-filled pastries because they may contain beef the U.S. Department of Agriculture warns is from "diseased and unsound animals" and is unfit for human consumption. The recall is voluntary.