Things that are occupying my brain this morning:

1. Why do people say "Hi, it's me" when you answer the phone? Who else could it be?
   
2. Why is it colder in winter? I should know this, but I can't remember.
   
3. And why is colder at the poles, winter or summer?
   
4. How and why does Immodium work?
   
5. Can you infect yourself with an illness you already have?
   
6. Why do white jet vapour trails on a crisp blue sky make me happy?
   
7. Why are Westlife popular?
   
8. What was I doing?