Riddles

What is always in front of you but can't be seen

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs?

The more of this there is, the less you see. What is it?

What has many keys but can’t open a single lock?

What invention lets you look right through a wall?

What goes up and down but doesn’t move?

What has legs, but doesn’t walk?

What has many teeth, but can’t bite?

What has words, but never speaks?

What has hands but cannot clap