Hello PopGeneJS is a free web-based platform for teaching population genetics, offering 32 interactive modules covering drift, selection, mutation, migration, linkage, and mating systems. Students and instructors can explore Wright-Fisher dynamics, F-statistics, De Finetti diagrams, and molecular summary statistics through real-time visualizations. No installation required??"runs in any modern browser. PopGeneJS modernizes PopGene.S (2005), expanding from 6 to 32 modules. Each includes help panels with formulas and references. A Python port is available for computational workflows. Web: https://popgenejs.bioinformat.org Code: https://github.com/Bioinformat/popgenejs Paulo Nuin nuin@genedrift.org nuin@genedrift.org (to subscribe/unsubscribe the EvolDir send mail to golding@mcmaster.ca)