At work I have to handle samples stored at -20 and -70 degrees Celsius, and they don't feel that different to me.

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    $\begingroup$ So you're handling things nearly as cold as dry ice without protection? Sounds like a bad idea. $\endgroup$ – Nuclear Wang Oct 22 '15 at 9:20
  • $\begingroup$ I touched -70 accidentally, it didn't felt as cold as I had expected. $\endgroup$ – Ahmed Abdullah Oct 22 '15 at 9:35
  • $\begingroup$ Are you referring to the difference limens in the -20oC range at normal hand temperature, or when the hand is cooled to such temperatures? One way or another, scientific studies addressing either question have probably not been carried out due to ethical considerations. Very brief touching of cold objects may be ethically OK since the skin is not under-cooled, but such experiments are for the same reason futile because they don't tell you anything. $\endgroup$ – AliceD Oct 22 '15 at 11:31
  • $\begingroup$ @AliceD Normal hand temperature. $\endgroup$ – Ahmed Abdullah Oct 22 '15 at 14:28
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    $\begingroup$ This article goes into detail about what affects thermal thresholds in human skin. scholarpedia.org/article/Thermal_touch $\endgroup$ – akaDrHouse Oct 24 '15 at 16:37

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