Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
What flies forever, Rests never?
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