A short explanation as to how this crowd-sourcing works:


It begins by dividing the total subject area into categories. For example, one of them is '3D Printing Materials'. Then, using 10 different search engines and multiple search terms, we find out what anyone interested in this category would be likely to learn by using search engines. From this list we choose what we consider to be the best 20 choices.


We then throw this list open to various experts and practitioners (and discussion forums) to use their knowledge and experience to improve upon these selections. The many suggestions for improvement are then voted for - to choose any that are judged to be preferable to those selected by the various search engine algorithms.


To see how this works, here is the current selection for the category of '3D Printing Materials': www.3dprintingtown.info/best20_materials/. Can anyone in this group suggest any improvements?