Module 7 : Bigger & Smaller
  Lecture 26 : Screw Paradigm, Conclusion
 

(Readmore:http://www.google.co.in/search?um=1&hl=en&q=Screw&bav=on.2,or.r_gc.r_pw.r_qf.&biw
=1332&bih=581&ie=UTF-8&sa=N&tab=iw&ei=UuNKUIGMMcq3rAeB3IGgCA
; Sept. 2012)

screwheadsinstructable1
fastener-basics-ga-2
Plate 44 Types of Screw
          (Source: http://en.wikipedia.org/wiki/Screw ; Sept. 8, 2012)

Conclusion :

The
bigger and Smaller Paradigm extends to number of related paradigms. It contracts, expands, etc with the help of various mechanism. However, overall concept of bigger and smaller inspires man to create numerous devices since the beginning of mankind.