Most of the time we keep up to speed within our chosen field. Reading information from other professions gives a broader viewpoint that can be exploited. Combinatorial ideas can then cross the boundaries between the two fields. It does not require you to become an expert in the other field. Brushing though the new area will enable you to pick up new viewpoints. Twisting the idea into your own area of expertise can yield a brand new usage.
The larger functional distance between the two related fields the more likely you are to see something of use. Understanding the other professions unique terminology is key.
Dabble around, read into new areas, expand your views and let the unexpected have a chance to surface.