Answer:
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
What dentists battle on a daily basis
What is it that no man ever saw, which never was, but always will be?
There is a man in a 4 story building. He jumps out of the window and is unharmed. He used no padding, and had no harm done. How?
Which weighs more? A pound of iron or a pound of feathers?
In all the world, none can compare, I am a tiny weaver; my deadly cloth so silky and fair. What am I?