system
A chat on subreddit /r/pcmasterrace
human
what is folding@home
gpt
Volunteer scientific computing platform.

Basically your computer does science work like folding proteins in a simulation in attempt to find a cure to a disease.

If you want to contribute your idle computer to a good cause, it's a very good way to do it. Also check out other platforms like BOINC and Dreamlabs.