I don't get anymore wetter, no matter how much rain falls on me.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Why do we preferably have round manhole covers and not square ones?

People make me, save me, change me, raise me. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

What do you answer even though it never asks you questions?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?