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Hey No Smoking

Science brain teasers require understanding of the physical or biological world and the laws that govern it.


Puzzle ID:#14953
Fun:*** (2.85)
Difficulty:** (1.63)
Submitted By:od-1Aca****
Corrected By:tangled_brain




Duffus walked through the back door of a toy factory where the paint thinners were stored. He noticed two men working on an aluminium racking system. One man pulled out a cigarette and was about to light it when Duffus pointed at the large "No smoking" signs near the paint thinners. The man scowled and put the cigarette away as Duffus walked off into the plant. Moments later the fire alarm rang as the paint thinners went up in flames. The fire inspector questioned the two workmen who were by the thinners and was about to release them when Duffus interrupted, "You're not letting them go, are you?"
"Yes. There are no eyewitnesses and no evidence they were smoking as the whole area was burnt to a crisp. Besides, they claim that while grinding the edges off the racking a spark set off the blaze," replied the inspector.
"I can't prove they were smoking but I can prove they are lying," exclaimed Duffus.
How did Duffus know they were lying?


Aluminium doesn't produce sparks when grinding, so it could not have set off the fire.

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Oct 08, 2003

We spell it "Aluminium". Good teaser!
Oct 09, 2003

Dec 24, 2003

This is a good one. Not too many people know that. I surely didn't and I have worked with aluminum.
Jul 23, 2005

Clever! Thanks!
Nov 21, 2005

hey go me! i got it (for once). great teaser, had me stumped for a sec there!
Aug 22, 2006

Jul 28, 2012

i got it,right
Aug 12, 2013

I was able to get it just because it made sense based on the content of the teaser. However, I had no idea that aluminum does not produce sparks. Odd!

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