This led to the cryoegg, a prototype device due to be tested this summer, when it will be inserted into drillholes dug by other scientific projects.

Using technology used in headphones, the prototype device can halve the level of outdoor noise, even when the windows are wide open.

The prototype device was only capable of dispensing one smell at a time.

For example, a fully operational prototype device detecting casein in milk has been fabricated.

Operating on the same principles as traditional tubes, prototype device cathodes have been fabricated in several different ways.