1. What's the name for the family of billiards games played on pocketless tables?

2. Which city has often been referred to as 'San Francisco turned upside down' and why?

3. In what unique way is a Cephalophore saint depicted in art?

4. According to military custom, the US flag should be folded down to what shape when it's not in use?

5. From where does the Microsoft discussion forum, Channel 9, get its name?

For the answers, please visit: ten things i didn't know until last week.