If your satellite blows a fuse, how are you planning to replace it?

Colds definitely do... you feel cold because your body "wants" to be warmer than usual (and it turns up/down various systems to encourage you increase that temperature).

I know why they crack at all, but I'm actually surprised that almost boiling water doesn't cracked them best.

The cracking is due to the fact that almost everything expands as it gets warmer, and if one part expands (or shrinks) more than other parts the stress forces can cause the connecting areas to snap and disconnect.

You get the same effect and can shatter glasses and mugs by very rapidly cooling or heating them (think hot tea in a cold glass, or ice cold drinks in a glass from a hot dishwasher).

My best guess on it NOT cracking in super hot water would be that it melts the surface quicker than the layer of warmed (but still frozen) ice can get thick enough to have enough stress built up to shatter free.

It's also possible the latent heat absorbed by melting off that surface is acting to cool the transition a bit, so the faster it melts the (effectively) better the cube is insulated, as sort of an ablative thermal stress guard, but I would expect that effect to be swallowed up by the vastly greater thermal difference without much notice.

Not 100% sure on all allergic reaction mechanisms, but I can tell you anything involving blood moving up to the surface isn't going to happen.

In hives and other rashes, the raised red surface is because your microscopic blood vessels react to let more blood flow into the area.

When you are dead, those tiny blood vessel walls are no longer reacting, and the blood isn't flowing.

In fact, the blood settles on the bottom of your body as it's no longer being kept moving and muscled back from where gravity pulls it - this is called liver mortis.

This is the answer.

2 inch is overkill though, two layers of half inch or so one at the outside and one neat the inside of the opening will be THE most insulated part of your wall.

The stuff is incredibly light, incredibly easy to slice with a boxcutter, and incredibly incredibly insulative.

Cut it intentionally a bit bigger, put it in diagonally and push it towards being flat.

It will wedge and seal like the dickens as you shove the leaning sides.

Then do another one or so their is air space between them.

Measure your hole before you go and cut with 2 inches spare there.

(These things are cheap, but come in huge sheets that are a pain to transport)

Then stick the spare stuff in the back of your closet and haul it out whenever you want to be constructive over the years.