I’m tall when I’m young, and I’m short when I’m old. What am I?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

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

Can you find out the number that should replace the question mark with a valid reason?

Which country gets ill every time?

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

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

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?

What does this Rebus Picture means ?