Anna visits some amphibious houses in the Netherlands and looks at a miniature tracking device. Matt reports on a coffee cup lid that changes colour with the temperature. Kim goes for a drive in a mobile TV studio. Caroline finds a breath test that is helping doctors learn more about our bodies. Hayden drives a sports car that is purpose-built for both speed and the environment. Graham looks at an automated milking system in Oxfordshire. Adam and Jamie search Giants Stadium to test the myth that Jimmy Hoffa is buried there.