Thermos
Imagine: you put in HOT water - it stays hot. You put in COLD water - it stays cold. The question is then: how the hell the thermos KNOWS?!
Submitted by: Mikhail Sokolnikov
Imagine: you put in HOT water - it stays hot. You put in COLD water - it stays cold. The question is then: how the hell the thermos KNOWS?!
Submitted by: Mikhail Sokolnikov