What is the Surname of Barbie Doll?

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?

What is the next number in this series?

4,12,84,3612....

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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 does this mean?

CCCCCCC

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What does does this rebus picture means ?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?