"How much does the sky weigh?": and other questions

The BBC News Magazine is running a little competition in which they ask readers to answer questions asked by kids (with the questions sent in by flummoxed parents). The kids were generally between the ages of 4-6 and the answers ought to be engaging for children of that age. It is an interesting challenge. How well would you do on some of these questions? If you think you've got a good answer, you can post it on the BBC site - and make sure you tell us here too. The BBC site calls them all "science" questions, but about half of them belong elsewhere: ethics (3, 10), aesthetics and/or psychology (8), theology (7) and perhaps the hardest of all in philosophy (5). Here are the questions. I'd quite like to know some of the answers myself.

1) Why don't all the fish die when lightning hits the sea?

2) How much does the sky weigh?

3) Why can't people leave other people alone?

4) Why are birds not electrocuted when they land on electricity wires?

5) What is time?

6) Why is the Moon sometimes out in the day and sometimes at night?

7) Why did God let my kitten die?

8) Why do I like pink?

9) Why is water wet?

10) Why does my best friend have two dads?

Image by HCS.