Extensive collection of experiments illustrating fundamental principles of physics. Demonstrations on this disc: Sound Production - guitar and scope, sonometer, tuning forks, adjustable tuning fork, rectanguar bar oscillation, high frequency metal bars, xylophone bars, singing rods; Properties of Sound - siren in vacuum, siren disc, gear and card, cutaway speaker, sound velocity at different temperatures, sound in helium, Fourier synthesizer, vocal formants, acoustic coupling, tuning fork beats, beats with speaker and oscilloscope, two speaker interference, Doppler effect. Kit contains: DVD with English and Spanish audio tracks and subtitles, and bilingual study guide.