For experimental stuff, it’s crucial to show first, explain later - if at all (otherwise you are killing the sense of suspension and awe):
The researchers’ conclusion was that, in the context of strange toys of unknown function, prior explanation does, indeed, inhibit exploration and discovery. - from http://www.economist.com/node/18741484 (When should you teach children, and when should you let them explore? - The Economist )
At the same time, yes, I agree it would benefit for adding some explanations, descriptions or links later. Just... many project, little time. But thanks for bringing it up!