Spot what is wrong here in below Picture?

What is always in front of you but can’t be seen?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

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.

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Take away the whole and some still remain. What is it?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.