Physics educators may already be familiar with the highly regarded website The Physics Classroom, but chemistry instructors and students should also check it out. In addition to their numerous Concept Builders for physics (see the 5-18-2018 Scout Report), The Physics Classroom has recently created a series of Concept Builders for chemistry as well. For those unfamiliar with The Physics Classroom's Concept Builders, they describe them as "interactive questioning modules that present learners with carefully crafted questions that target various aspects of a concept." As of this write-up, the site offers 30 of these tutorial modules for chemistry, and the creators plan to add more during the upcoming academic year. Some of the concepts visitors will find covered on the site include fundamentals like significant digits and identifying the difference between chemical and physical properties, as well as topics including stoichiometry and the Bronsted-Lowry model of acids and bases. First launched in 1996, The Physics Classroom is the creation of Tom Henderson, a physics and chemistry teacher at Glenbrook South High School in Glenview, Illinois.