A microscopic worm may shed light on how we perceive gravity

While humans rely on gravity for balance and orientation, the mechanisms by which we actually sense this fundamental force are largely unknown. Odder still, the model organism C. elegans, a microscopic worm, can also sense the direction of gravity, even though there is no known ecological reason for it to do so.

source https://phys.org/news/2021-09-microscopic-worm-gravity.html