eLife assessment
This paper provides valuable insights into the consequences of hydrogen sulfide (H2S) exposure on the behavior and physiology of the nematode C. elegans. While solid evidence supports most of the paper's findings, the evidence that H2S is detected by the nervous system to mediate behavioral avoidance is incomplete. The paper provides a wide range of intriguing observations that could serve as a foundation for future work to synthesize these disparate results or provide insight into the mechanisms of H2S detection in C. elegans.