system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How we can cool things down to close to absolute zero.
gpt
There are devices called cryocoolers, without getting into details, they're really good refrigerators. If you only want to cool down an atom or molecule we can use lasers, since heat is expressed on the atomic scale as motion, we can use lasers to push the atom/molecule in the direction opposite to the direction it's currently going. by doing this to a high precision, we can get down to tiny fractions of a kelvin.