# Citizen science frontiers: Efficiency, engagement, and serendipitous discovery with human–machine systems

> Research article (Proceedings of the National Academy of Sciences, 2019) · cited 91× · AI/ML

**Wikidata**: [openalex:W2913507157](https://www.wikidata.org/wiki/openalex:W2913507157)  
**Source**: https://4ort.xyz/entity/citizen-science-frontiers-efficiency-engagement-and-serendipitous-discovery-with-humanmachine-systems