What goes up but never comes down?

It is always ahead of me yet I can never see it. What is it?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What came first, the chicken or the egg?

How can you leave a room with two legs and return with six legs?