We present a modernization of the undergraduate physical chemistry laboratory experiment for determining the speed of sound in various gases from resonant frequencies in a spherical resonator. The resonator (schematic IR = 7.5 cm) is constructed by 3D printing with eco-friendly poly(lactic acid), a commercially viable alternative to traditional…

Lessons and homework problems involving a pendulum are often a big part of introductory physics classes and laboratory courses from high school to undergraduate levels. Although laboratory equipment for pendulum experiments is commercially available, it is often expensive and may not be affordable for teachers on fixed budgets, particularly in…

One of the more effective ways to convey the story of our origin and evolution is to present the entire chronicle in a multimedia format that allows today's tech-savvy students to browse at will, thereby extracting parts of the story at their own pace and comfort. This article describes an interactive CD-ROM (included in this issue of "The Science…