Naming difficulties may be rank ordered along a continuum. Items are rank ordered in terms of their ability to be named, which is correlated with their frequency. This type of picture-naming test is also useful in the examination of children with learning disabilities and the evaluation of brain-injured adults.
The Jarvik-7 heart was developed by American scientist Robert Jarvik and his mentor, Willem Kolff. In 1982, Seattle dentist Dr. Barney Clark was the first person implanted with the Jarvik-7, the first artificial heart intended to last a lifetime.
Thomas Edison: the man who created the modern world. Thomas Alva Edison (February 11, 1847 â October 18, 1931) was an American inventor, who invented many things. Most people think he invented the electric light bulb, but he really only made it better, to make it last long enough to help people see in the dark.