Answer:
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
I run up and down the stairs without moving
I am the place where yesterday is always before today. What am I?
What goes up a chimney down but can't go down a chimney up?
To cross the water I'm the way. For water I'm above I touch it not and truth to say I neither swim nor move.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?