KubeRoot

The short version is - if you’ve ever heard of infrared cameras that can see heat, that’s because everything glows based on heat. When things are very hot the glow is visible, but even cool things emit light outside of the visible spectrum. And emitting light takes energy, which means blackbody radiation (as this is called) takes energy (heat) away.

Snail mail is traditional mail, in this case presumably sending a physical data storage device for those terabytes of data, which could maybe be faster and more reliable than networking it.