system
Given the following post, respond as if you're commenting on Reddit:
human
Why can't I put metal in the microwave?

I know it'll spark and go nuts, but what do the micro waves do that make this happen??
gpt
They bombard their interior with a form of electromagnetic radiation (before you get scared by that word, visible light is a form electromagnetic radiation as well) called microwaves.  Metal, especially metal with sharp edges and points, will end up refocusing and concentrating those waves which is what creates the sparks.