How can one talk without saying a single word?

I am the fastest animal but cannot climb the tree. What am I?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A blonde put eyeliner on her head. Why?

Can you name some countries which do not have the alphabet 'A' in them?

I can write cow in 13 letters.

Can You?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

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 ?