You'd think that everyone on the planet would know how to use a flush toilet ... and signs to teach what you've gotta know when you've gotta go. And since today is World Toilet Day, we thought ...

Karen Deerwester, author of The Potty Training Answer Book, says that with a little coaxing and encouragement, most kids can tame ... them to still watch you flush the toilet.

The Conversation is asking kids to send in questions they’d like an expert to answer. All questions are welcome – serious, weird or wacky! Where does my poo go when I flush the toilet?