http://innerpilgrimage.wordpress.com/2012/09/04/oh-the-places-youll-go/ and other things got me thinking, each generation must learn the same lessons, if nothing changes. If something changes, it is a new lesson, or a slightly different lesson.
We geotechnical engineers are now seeing the long term effects changes in the building code from 1995 changes, but I digress. These are the same lessons from the 1962 building code, that stopped being a problem after changes were made. It make the problem clear though, we change, and something else comes up, and forces more change. Life is constant change, and we need to recognise and adapt to the new changes.