Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

The dirtier I get, the whiter I look. Who am I?

What have one eye but still cannot see?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

I am white when I am dirty, and black when I am clean. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?