What seven-letter word has hundreds of letters in it?

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.

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Can you identify if it's a murder or a suicide ?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What is the below Rebus indicate?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?