How to make a lighter that works "forever"

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Old gadgets passed down for thousands of years, Chinese wisdom passed down from generation to genera

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Come on, a piece of paper can be so interesting to ravage. Stress resistant transformer!

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It looks so cool, I feel like I’m not alone in feeling this.

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One word: expensive! Two words: super expensive!

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Cool operation! Learn this trick and teach you how to open any lock

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Isn't this a perpetual motion machine?

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Where did I plug the charger in last night?

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The Impossible Twelve Copper Pillars

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