Roger Moore, Sean Connery, Pierce Brosnan and Daniel Craig – they all have used spy cameras at one level of the film or another. Using powerful magnet technology, the Again Hero works in line with your nervous system, which allows you to relieve your again pain naturally. And also loads of different small and interesting low cost electronics and cool innovations.

Air conditioners offer the advantage of two separate air cycles (closed-loop cooling) with a dusttight seal between the ambient and inner air cycles. The difficulty is that within the mine (or equivalently in a desert or some excessive-temperature industrial setting) the constant warmth means the conventional methodology of cooling parts – by fanning the ambient air over them – merely wont work.

The team believes that the crystal...