This episode is about the practical changes that appeared during the middle of the 20th century in chemistry laboratories. These are infrared spectrometers, pH meters, visible-ultraviolet spectrophotometers, mass spectrometers, nuclear magnetic resonance instruments, and chromatographs. All of these electronic instruments made the laboratory of the 1960s a most different place than the laboratory of the 1920s. We hear about some of the people who invented and promoted the use of these new chemical tools.