Hard clean riddles with simple answers

What does a house wear?

I am something to make you think, I am something to make you know. I am something to which the answer you might never know. What am I?

When you do know me about me, them I am definitely something. You will always search for me. But when you know me, I am nothing. Who am I?

I weigh almost nothing. I am lighter than air. But even the strongest man in the world cannot lift me. What Am I?

Alive without breath, As cold as death; Never thirsty, ever drinking, All in mail never clinking.

On the first day they cover one quarter of the total distance. The next day they cover one quarter of what is left. The following day they cover two fifths of the remainder and on the fourth day half of the remaining distance. The group now have 14 miles left, how many miles have they walked?

I move very slowly at an imperceptible rate, although I take my time, I am never late. I accompany life, and survive past demise, I am viewed with esteem in many women's eyes. What am I?

What goes through towns up hills but never moves?

What is everthing yet nothing, has no start and no end, creates yets destroys, brings life and death what is it?

It's 7:00 am. You are asleep and there is a sudden knock on the door. Behind the door are your parents, who came to have breakfast. In your fridge: bread, pasteurised milk, juice, and a jar of jam. What will you open first?