Forgotten

Something I forgot to mention was while we were sitting in Gringos waiting for the waitress to some back and take our order we saw this paper that was placed on all the tables advertising the buisnesses around here and what not. Also on it were about 20 questions. Before you read the questions it says something to the effect of "Questions that people ask but there really isn't much of an answer" type thing. Anyways we thought they were pretty funny and thought we would share some. See if you can answer any of them:
1) Why do people believe you when you tell them there are 4 billion stars in the sky but not when there is wet paint
2) Why do kamikazees (spell?) wear helmets?
3) Why does Tarzan not have a beard?
and
4) Why doesn't glue stick to the bottle?