Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
The Titanic is still here. What am I?
I am a key that is playful. What am I?
I am the most famous dinner ever attended. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
I am the kind of an ant that's good at math. What am I?