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Robobvious t1_j5e40xt wrote

At fifty years old the insulating layer between the inner walls of the thermos has probably long since disintegrated.

Get a thermos for your thermos.


General_Albatross t1_j5e5pp2 wrote

Thermoses are insulated with vacuum.


atfricks t1_j5e7vna wrote

They used the wrong wording, but the issue is almost certainly that the vacuum failed, and it's now just insulated with air.