Using fart spray in medical training

It teaches students how to maintain focus in adversity

A plastic-bottled spray that smells like fart and faeces has morphed from a childish prank into a useful medical training tool.

Invented by two former US engineers, the foul-smelling stench, known as Liquid Ass, was originally designed to appease their bathroom humour, but the two North Carolina men say it's now being used for more noble pursuits.