At the start of the last UK series of Eureka ( series 4 I think ) and Warehouse 13 ( Series 3? ) there is a swapping over of characters. Claudia visited Eureka and Fargo visited the warehouse. Which I think is cool, because it messes with my head.
However, it seems that there are fundamental differences in the world-view between these two. I accept that neither tries to be entirely and completely consistent, but Warehouse deals with "supernatural" artefacts, things that cause behaviour that is not empircally proveable. Most of the time, people have left their "influence" on objects.
Whereas in Eureka, everything is ameneable to scientific exploration. The concept of an artefact that somehow retains the influence of its user, without having had some Eureka magic on it, would be ridiculous.
So how can they actually co-exist?