Answer:
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I shoot but never kills
I can be found in water but never wet
I climb higher as I get hotter. I can never escape from my crystal cage.
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
How can you tell when a mummy has a cold?