Steven Puetzer/Photographer's Choice/ 足Around 10,000 years ago, man started to make fundamental changes in the way he lived. Slowly moving away from a nomadic lifestyle, he started staying in one place for longer periods.

This was probably due to the ending of the last ice age creating more abundant resources. Man didn't have to travel as far to find food, so he stayed where food was plentiful. Over time, a more settled lifestyle brought some challenges with it. Instead of having to find caves or create makesift shelters from animal skins for protection from the weather, man started to look for more durable materials with which to build long-lasting dwellings [source: ]. 足Over time, man has used a variety of materials, and they help to paint a picture of our 足ongoing quest to make long-lasting structures to meet our changing needs. Solar energy by s p sukhatme pdf to word free. The evolution of architecture meets those challenges and handles the cultural perception of what those buildings should look like and how they should be used.

Using statistical analysis and laboratory testing to evaluate the effect of magnetized water on the stability of foaming agents and foam concrete.