system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does looking up at the sun make you sneeze?
gpt
Not for everyone, some people posses a genetic "flaw in the wiring" of *nervus trigeminus* that innervates parts of the nose (and triggers sneezing when irritated in a particular way), part of the face and parts of the eye. The glitch in wiring of the cables makes your brain think that the strong stimulus from the eye (stong sunlight) is coming from the nose as well and something should be done about it - a sneeze.