Explain why manhole covers are round. Why is this design better than, say, a square design.

You have a closet with 300 shirts in it. Consequently, you find it hard to find a shirt quickly while dressing for work in the morning.

What can you do to organize your shirts to minimize the time that it takes to find the correct one?

Imagine a bear walks the following paths:

1. South one mile
2. Left turn
3. East one mile
4. Left turn
5. North one mile

The bear arrives at where he started. What color is the bear? Why?