Place something like a coin on top of the ice. If the ice melts, the coin will s... | Hacker News

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m_eiman on June 10, 2011 | parent | context | favorite | on: How to replace 30 laptops (and $10,000) with 150 s...

Place something like a coin on top of the ice. If the ice melts, the coin will submerge and be inside the ice if it re-freezes. (Assuming you put the ice in a container).

stonemetal on June 10, 2011 [–]

That is interesting because you could tell how long the power had been off by how deep the coin was in the refrozen ice.

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