If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

There is something which is always coming but never arrives?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Spot 5 differences in two Christmas tree below:

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

If an electric train is travelling south, then which way is the smoke going?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

What building has the most stories?