The more of this there is, the less you see. What is it?

It is always ahead of me yet I can never see it. What is it?

Different lights make me strange by changing me into different sizes. What am I?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Can you replace the question mark with the correct number in the below table sequence?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What jumps when it walks and sits when it stands?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?