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Science all around you

Our coverage of Science all around you consists of one project (1 session).

(7) Chemiluminescence: The light from fireflies and blood stains

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This project involves experimental studies of luminol (light-emitting) reactions, which are used in detecting blood stains for criminal investigations. The project offers an opportunity to study both the mechanism of light emission and the mechanism of blood-stain detection. By performing light-emission experiments on sea fireflies, students also learn that the same mechanisms are at work in this process as well.

Science and culture

(8) Music and the vibration of strings (1 session)

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Essentially all forms of music on Earth can be notated on a five-line staff. This fact should surprise you given that music is an art form that developed independently in different regions and by different peoples of the globe. Indeed, this observation demonstrates the existence of something universal—governed by the laws of nature—underlying all music (pitches). This universal phenomenon is the mechanism of vibration in strings and tubes. You will start by using a guitar to understand the characteristic vibrations (standing waves) of strings. Once you have understood standing waves, you will be in a position to appreciate the existence of two distinct approaches to pitch tuning: just intonation (natural scale) and well-tempering. So which of the two is logically superior? This is a question that has no answer. In today‚Äôs world, Western piano music uses well-tempering. This is because Bach—who could be called the father of Western music—believed that well-tempering, which allows modulation, was particularly beautiful (admits superior music expressions). Logical thought processes thus reveal many outstanding options. However, our goal is for you to appreciate that, in cultural problems and problems of daily life, the question of which to deem more beautiful is ultimately one that depends on individual personality and sensitivities.