Answer:
What word has kst in the middle, in the beginning, and at the end?
If I have it, I don't share it. If I share it, I don't have it. What is it?
What can you throw but not catch?
What can't you see, hear or feel, until its too late. What shadows love, and shopkeepers hate?
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?