Out of Step on the Bridge

(image from Wikipedia)

The Millennium Bridge in London, England, which opened in 2000, became famous for its "wobbly" motions after crowds of pedestrians moved across it. Different theories into the nature of the bridge motion were developed, one of which was highlighted in the May 2009 issue of ASCE's Civil Engineering Magazine in an article entitled "Bio-mechanics Research Yields Clues to Millennium Bridge Wobble." Dr. Kareem has provided some insightful follow-up comments to this article.