Answer:
What is it that leaps and runs and yet, has no feet?
There are four of these, but everyone's favorite seems to be spades.
Once you know it exists, it no longer exists. What is it?
A standard dimension for sandwiches and rulers
What occurs once in a minute, twice in a moment and never in one thousand years?
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?