What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Give it food and it will live; give it water and it will die.

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

What is harder to catch the faster you run?

A tourist visits a small town for his research. While in the town, he decides to get a haircut. Since the town is quite small, there are only two barbers in the town � one on the North Street and one on the South Street. The barbershop on the North Street is a mess and the barber has a weird and pathetic haircut. While the barbershop at the South Street is pretty tidy and the barber as well has an impressive haircut.

Which barbershop will the tourist visit for his haircut and why?

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

What work can one never finish?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?