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.

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

How far can you walk into the woods?

What makes this number unique: 8,549,176,320?

Can you name an animal whose killing cannot be performed without spilling your own blood?