Another thing that may interest you:
I held a little technical seminar today,
where the topic was to see if we could find max and min working/not working temperature range of several normal electronic devices.
For the test I used a normal two layer pcb and mounted a few parts.
The AVR microcontroller Mega168-20AU
I use is rated -40C to +85C a range of 125C
I found out this:
it still worked just fine at -183C fully covered in LOX,
and failed at +180C when it was floating in liquid solder.
a working temperature range of 363 Celcius, that is quite amazing :-)
want to see pictures/video clip of this test ?