Find the number of squares in the below picture

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

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?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Replace the question mark with the number below given a simple math problem.

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?