Which is the correct shadow of the bird?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

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

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Which tank will fill first?