What does this mathematical rebus means ?

What is the next shape from answers A, B, C, and D figure?

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

A man dies of old age on his 25 birthday. How is this possible?

What is the coolest letter in the alphabet?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Can you solve below mathematical equation?

2^1234 - 2^1233

Can you divide the below-given shape into four equal and identical pieces?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?