Why 1729 is a magic number? Answer Logically.

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 ?

Count the number of triangles in the given picture.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

In the image below, can you find the value of an angle(y)

Solve this riddle by finding the odd one out from the rest.

How can you take 2 from 5 and leave 4?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

I look at you, you look at me, I raise my right, you raise your left. What am I?