Dr. James L. Marshall describes the half-life of technetium and promethium. From the DVD "A Visit with Dr. Jim Marshall." The DVD is designed to be used as an educational tool; it contains information about each element and ores from the original mines of discovery. Experiments using the elements are included showing their spectra, magnetism, fluorescence, and mine source, as discussed in the book "Discovery of the Elements; a Search for the Fundamental Principles of the Universe, 2nd ed," by Dr. Marshall.

Video copyright 2005, 2006, 2007 Dr. James L. Marshall & Virginia R. Marshall

The book is available here. [ Ссылка ]

Check us out on the web at "Rediscovery of the Elements" for more information on the elements and their discoverers. [ Ссылка ]

Find us on Facebook. [ Ссылка ]

For more information about Jim: [ Ссылка ]

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