From the U.S. National Library of Medicine’s (NLM) Toxicology and Environmental Health Information Program and the U.S. Society of Toxicology, ToxLearn is a free online educational tool that provides an introduction to fundamental toxicological principles and concepts. Soon to be broken into 3 modules available on the web or in pdf (currently only 1 module exists), it is written for the general public and users of NLM’s toxicology databases. It is accessible from our Toxicology/Occupational Health Resources web page at: