== The O-rings == 

 It seems perverse in this otherwise very informative article, not to mention either a) The construction of the boosters out of a number of segments joined together with sophisticated double O-ring seals or b) The fact that it was the failure of one of these seals that was directly responsible for the Challenger disaster - particularly, since the latter incident and some of the changes that resulted are detailed in the article. My knowledge is limited to what can be found on the web - and elsewhere in Wikipedia - nevertheless, I have included a modest section on the O-ring sealed construction. I invite others with more knowledge to edit and expand this.