X-rays and their uses. X-rays are one type of electromagnetic radiation. They are commonly used in hospitals to produce photographs of bones which can be checked for breaks or fractures. X-rays have the following properties: they can penetrate less dense matter such as skin and body tissue (but not bone)
The historic Glensheen Mansion, along London Road in Duluth MN, was built for Chester Congdon and his family. Chester Congdon went from being a school teacher in Wisconsin to being the wealthiest Minnesotan at the time of his death in 1916, worth 40 million dollars.
19 crazy facts about Bill Gates' $125 million mansion. With a net worth of $83.9 billion, Microsoft cofounder Bill Gates is the richest man in America. It shouldn't be too surprising that one of the wealthiest people in the world also has an insanely extravagant home. It took Gates seven years and $63 million to build his Medina, Washington, estate, named Xanadu 2.0 after the fictional home of Charles Foster Kane, the title character of Citizen Kane..