The science of sound – or acoustics to use the proper term – is nothing new. Greek mathematician Pythagoras knew about sound waves 2,500 years ago, and in the 18th century scientists were aware that sound ranged beyond that which was able to be detected by the human ear. A human ear can detect sound up to a frequency of 20 kilohertz, and therefore anything above this is known as ultrasound. The concept of ultrasound as a diagnostic technique dates back to the 1940s, and the technology has progressed rapidly ever since. So how do we effectively train people to correctly diagnose using increasingly sophisticated equipment?