When does something lose its usefulness? How do we know when something actually has become useless?

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Has the empty thermometer shell become useless? The numbers seem to be meaningless without something to compare them against. But it is possible that someone is curious about the equivalence of Celsius and Fahrenheit. Thus, they would prove useful again. Possibly the shell itself is attached to it’s environment so much that taking it down would cause damage. Is it’s purpose just to make me stop and think about such things?

Have an awesome Thanksgiving everyone! If you are outside the US, take heart. I will eat extra food for you.