There is someone, and there is always another, for without the other, there wouldn't be one

Answer: twins

More Difficult Riddles with answers

More Difficult Riddles

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends. What is it?
They belong to me; they belong to you; They can make you feel happy or make you feel blue; They never end until the day you do.
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own. What are they?
They make no sense at all, In them you either fly or fall. They make you do it all. Their need is biologic, but they are most illogic. They are not real but still can be achieved, If they are just believed
They try to beat me, they try in vain. And when I win, I end the pain.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
Thirty men and ladies two, gathered for a festive do; Dressed quite formal, black and white; soon movement turned to nasty fight.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
This is needed both for courage and hardcover books.
This is rectangular, hollow and has a lid, and where you’ll find it you might wonder, it is just six feet under. What is it?
This only turns over once you have traveled very far. What is it?