system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a reason why the more dangerous frequencies (UV, X-ray, gamma) and the "harmless" frequencies (radio, IR) on the EM spectrum are separated by the visible wavelengths?
gpt
Try not to think about it like the two regions are "separated" by the visible light region. Saying like that kinda puts the cart before the horse. 

Those frequencies aren't inherently visible. Our vision evolved to be sensitive to those frequencies that are highly abundant from the sun. The fact that there are two regions on either side of it, one bad one harmless, is a coincidence.