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

Replace the question mark with the number below given a simple math problem.

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

What runs around the whole yard without moving?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your