Answer:
Until I am measured I am not known, Yet how you miss me when I have flown.
It is destruction made out of thin air, You hear it howl and give a prayer, Through barns and houses it will tear. It is a deadly funnel, Of violent and twisting air.
What is the smallest bridge in the world?
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
What goes in the water red, and comes out black?
What never gets any wetter no matter how hard it rains?