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Green tunes Sir — Trees have life — Jagadish Chandra Bose proved this in 1901. Studies then showed that trees can also emit ultrasonic sounds when stressed. But an ongoing concert in India, Echoes of Earth music festival, is showing that not only do plants have a voice but they can also sing. Galvanometers are used to detect changes in bioelectricity and this is then converted into a form that […]