You can relight a candle without having to put fire next to the wick.

This video shows what may be the coolest party trick ever and an easy way to scam a few dollars out of dis-believers. Blow out a candle and then relight it through its smoke.

When a wick is lit, the flame vaporizes the candle wax and turns it into heat and light. As soon as you blow it out, the trail of smoke released by the smoldering wick still contains a bit of wax that hasn't fully burned. When you hold a fire source up to the wisps, they can reignite and cascade back down to relight the candle.

 

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