Educational Video: Shear and Torsion

I found series of videos on youtube.com illustrating the concept of shear and torsion affecting the structures during the earthquake. The instructors are from U of Illinois and supported by NSF and NEES (www.nees.org). In the video, the instructors deliver the complex concepts of shear and torsion in very simple way so that the audiences can understand the concepts very easily. Let's watch the videos below:

  

Introduction

Shear Effect

                                                         Torsion Effect

Combined Responses

Top 10 tallest buildings in the world

Here is the top ten tallest buildings in the world. It is very interesting that since 1998, the tallest buildings have been gradually increased in the construction in Asia rather than in USA or other regions. This might imply that the competition in constructing the world tallest structures using new material and technology is most active and interested by asian people. I am looking forward to seeing the next world tallest building and the next one must be in one of asian countries, probably, China?