Out of four images which one is the odd one out?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

Count the number of balls in picture below:

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Can you find out which number multiplied by itself will give the output as 12345678987654321?