National Geographic Society has Weird But True (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $1.99) for a limited time.

Recently updated with wild and wacky sound effects for all 300 facts, new Weird-O-Meter sounds, and other surprises. Hear the pronunciation of the official name of Bangkok, Thailand–it is 167 letters long! Plus, now you can share facts with friends and family via Facebook and Twitter with the touch of a finger.

Did you know that girls have more taste buds than boys do? Or that slugs have 3,000 teeth and 4 noses? And who knew that gorillas burp when they’re happy? Get more than 300 Weird But True kid-friendly facts with the interactive app from National Geographic Kids!

Based on the phenomenally popular department in National Geographic Kids magazine and best-selling book franchise, Weird But True is now available for iPod touch, iPhone, and iPad!