Answer:
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Sharp and long, flag of the world. What is it?
What can you put in a barrel to make it lighter?
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
You can see nothing else, When you look in my face, I will look you in the eye, And I will never lie.
I can only be played on a windy day