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

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you count the number of blocks in the picture below?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

You can hear me, but you can't touch or see me.

What am I?

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?