A boy and his big sister are sitting around the kitchen table chatting.
The boy says, "If I take two years away from my age and gave them to you, you'd be twice my age."
The sister added, "Why don't you just give me one more and then I'll be three times you age."
How old are the siblings?
They are both 6 years old. They had to have been born with in one year of each other.
What is so fragile that sound can destroy it?