[Trantor]

[ QUOTE ]
1. Is there a bear in the room you are in now?

2. Is there a flea in the room you are in now?

3. Are you sure?

4. Is the lack of evidence proof that something is not there?

[/ QUOTE ]
1. No.

2. I don't know but I think probably
not.

3. I am sure about the answer to q1. I am sure don't know is the correct answer to q2.

4. No.