What are all the even numbers in the world?

Answer 1

It is impossible to list all the even numbers in the world - there is an infinite number of them.

Suppose you were to list all the even numbers you could find in order, starting 0, 2, 4, 6 and so on up to some last number.

I could easily point out another even number in the world not in the list - I would simply add 2 to the last number in the list and declare that it is not in the list. You would have to add it, but then I would point out that this number plus 2 is not in the list and needs to be added.

We would go on like this forever - whatever last number you give for the list, I simply add 2 and point out there is another even number in the world not on the list.