system
Given the following post, respond as if you're commenting on Reddit:
human
Why does superconductivity only happen when its cold?
gpt
So superconductivity exists when two electrons pair and become a Cooper pair which happens to be a Boson. Bosons can occupy the same state at the same time, aka they can "pass through each other" rather than bouncing off of each other. 

Cooper pairs form due to a fairly long range phononic interaction (think physical vibration or sound wave). These phononic interactions actually happen all the time in most materials HOWEVER temperature vibrations break these pairs, so no Cooper Pairs can stick together for that long. When you cool a superconductor enough this allows them to stay together indefinitely.

This is at least the theory for type 1 superconductors, type 2 probably get more complicated than this.