Article: History of Radium Use

The link below is to an article that looks at how radium was used before we fully understood the risks involved.

For more visit:
http://www.mentalfloss.com/blogs/archives/145300

Article: The Richest People of All Time

The link below is to an article that tries to come up with a list of the richest people of all time.

For more visit:
http://www.mentalfloss.com/blogs/archives/146052