As the waters receded, flooded buildings were inspected by "strike teams" before owners were allowed to return and check out the damage. They used a color-coded system. Green meant the building was safe for occupancy, yellow meant entry should be limited and at one's own risk, red indicated serious damage/no entry, and purple was later used for buildings which were to be demolished. In biggest problems with homes were collapsing basements or foundations. In cases where water had reached the first floor or higher, there was failure of the floor joists, leading to a sagging or collapse into the basement.  The Time Check neighborhood is particularly hard hit, where several hundred homes were said to be beyond salvation and will be demolished. 
There are many excellent teaching resources about human evolution available on the internet. Here we have compiled a list of our favorites, including interactive and information websites, media coverage and news stories, and links to classroom activities. This collection of resources was specifically designed to help instructors find classroom activities and additional background information on the topic of human evolution, and was assembled for the 2011 Darwin Day Teacher Workshop, which was cosponsored by the JF Crow Institute for the Study of Evolution and NESCent.
Scholars debate the actual extent of the Celtic influence.   The Celtic influence and contacts between Gaulish and early Germanic culture along the Rhine is assumed to be the source of a number of Celtic loanwords in Proto-Germanic . [ citation needed ] But according to Belgian linguist Luc van Durme, toponymic evidence of a former Celtic presence in the Low Countries is near to utterly absent.  Although there were Celts in the Netherlands, Iron Age innovations did not involve substantial Celtic intrusions and featured a local development from Bronze Age culture.