Here's a collection of 40 different "imponderables".
Most of them have real answers, although most people don't really know WHY until they research them!
For example: "Why is there no mouse-flavored cat food?"
I plan on having these available (1 per week) for students to figure out. They'll earn some "money" for our classroom economy by doing some writing to convince me that their answer is correct.
Just something fun....