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Life Cycle in Color (Posted on 2003-02-05) Difficulty: 3 of 5
It's black when it's not in use, it's red when it's in use, and it's grey when you're done using it. What can this be??

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Rating: 2.7857 (14 votes)

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Solution answer | Comment 25 of 29 |
I've seen this one a lot. Its coal.
  Posted by Billy Bob on 2004-04-21 17:57:05
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