Introducing the not-so-loudspeaker

A prototype high-tech amplifier designed by a group of college students may spell an end to quarrels and fights between elderly dancing enthusiasts and their annoyed neighbors.

Standing next to a tripod with a projector at the apex, Zhu Liya, a student at the School of Media and Design at Shanghai Jiao Tong University, described how her team was inspired to build the machine when they attended a design workshop at the Sony Explora Science Museum in Beijing at the end of July.

"Dancing is good for both the mental and bodily health of retired women," the 20-year-old says, adding that she has conducted a survey of the dancers that confirmed the benefits.