Good Riddles

Question: If you have a cake, how many pieces of cake can you form with 3 straight cuts?

Question: Hold me by the neck and I won't mind,
if I get wrong I just need a good wind.
If you want me you better pick wisely,
just use your ears and I'll follow you blindly.

What am I?

Question: Drop me and the world will shatter,
and you can always find me where you empty your bladder.

What am I?

Question: Mr. Smith has 4 daughters. Each of his daughters has a brother.

How many children does Mr. Smith have?

Question: A man walks all the way around the world without getting wet.

How does he do this?