''' Acoustic devices are used in a range of applications such as ultrasound scanners, but their performance is limited for some uses by their inaccurate focusing and low focal power. Now a group of scientists in the US have developed an acoustic lens that ...'

'''A team of researchers at the University of Illinois has created the world's first acoustic "superlens," an innovation that could have practical implications for high-resolution ultrasound imaging, non-destructive structural testing of buildings and ...'