I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Be active and find the killer in the picture Riddle below.

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

You need to arrange three 7 and mathematical symbols to form number 1?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.