What can be folded once but never unfolded again, yet holds no shape?
Category: Brain Teasers · Difficulty: hard
Hint: Consider something that physically changes when folded once but can’t be returned to the original state.
Answer
A single folded paper
Explanation
A piece of paper creases permanently after folding, making unfolding unable to restore its initial smoothness.
This is a hard brain teasers riddle — a tricky one that takes a little thought. The answer is A single folded paper.
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