Answer:
What goes up and down stairs without moving?
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
I work when I play and play when I work
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
What jumps when it walks, but sits when it stands?
Why is the letter B always cool?