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.
After getting an investment from his mother, he founded SoftKey Software Products in his basement upon graduation from college. After acquiring The Learning Company, he sold it off to Mattel in 1999 for $3.7 billion. As of 2017, OâLearyâs net worth is estimated to be over $400 million. Currently, the multimillionaire is hoping to cross over from business to politics as a candidate to become the leader of Canada's Conservative party.