I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

The dirtier I get, the whiter I look. Who am I?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

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

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What country can make you shiver?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

I’m tall when I’m young, and I’m short when I’m old. What am I?