Nice set of photos on Flikr posted by the Smithsonian Museum - with no known copyright restrictions. Awesome.

http://flickr.com/photos/smithsonian

There are a few other museums that have contributed to Flikr commons:

http://flickr.com/commons

Hmmm...Lucky rats.

Marijuana lessens brain inflammation, possibly reducing effects of Alzheimer:

http://dsc.discovery.com/news/2006/10/19...