Iron Riddles

I Can Eat a Lot Of Iron
Riddle:
I can eat a lot of iron without getting sick. What am I?
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Gollum's Riddle
Riddle:
This was Gollum's final riddle from The Hobbit: "This thing all things devours; Bird, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slay king, ruins town, and beats a mountain down."
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