Getting rid of orphan vertices.

Oh you orphan haters !

The following method has first been offered by the well known *Jean-Michel Soler* on the french Blender newsgroup at Le Zoo. That tip is now part of the FAQ of the same newsgroup.
After modelling for some time on a project, it quite often happens that we have created orphan vertices and orphan edges that are not a part of any face and still are part of the mesh. These spell trouble for subsurfing and smoothing among other things. Here's a neat trick to get rid of them.
	We will be using the default uvsphere for our example. Create one.
	Poke holes in the sphere, erasing vertices. Try to leave both, orphan vertices and orphan edges.
	When you're satisfied, select every remaining vertice with AKEY.
	Create one new material for the sphere remains.
	Assign that material.
	Unselect every vertice using AKEY.
	Use the selecting function of you material to select only the vertices that are a part of face.
	Notice that the orphans have not been selected.
	Use select swap to select only the orphans.
	Erase them.
	Now, the only vertices remaining are part of a face.
Ta-daaaa! Good night.