Making waves

摘要

I MAGINE a medical device that could treat an enormous range of our ills, both big and small. A gadget that showed promise for destroying cancerous tumours or obliterating the body fat associated with obesity. Or that was potentially effective against the likes of back pain and glaucoma - and that was even versatile enough to be considered as a tool for tackling depression or anxiety. Surprisingly, such technology exists. Even more surprisingly, it works simply by generating sound waves.