Thermos question

A thermos flask keeps cold water cold and warm water warm , but how does it know which is cold and which is warm ?????

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I think it just insulates it. So whatever it is it just keep it at that temp.

krass · 31-35

@Spoiledbrat I know how it works ..but how does it know?

ElRengo · 70-79, M

@krass
Nature, physical laws, do not need knowledge to work like they do.

krass · 31-35

@ElRengo They have to know something?

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ElRengo · 70-79, M

Now I am amused.......
What in........ makes my previous post to be "fetish"????