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DENTON (CBSDFW.COM) – University of North Texas chemistry professor Jim Marshall’s hobby combines his love of history and science.

He shared his passion for the elements of the periodic table with his wife Jenny. Together they traveled the world seeking the elements.

“We have sloshed though swamps, we’ve climbed stairs, we’ve climbed mountains,” said Marshall about their adventures.

Their rarest find was tellarium; discovered in a remote Romanian mine.

“Tellarium was the first metal we found… running up the mountain side, holding on to the crash bar for dear life,” remembered Marshall fondly.

Sadly, their adventure ended with Jenny’s death two years ago from a heart attack.

“I was the dreamer and she was the driving force,” said Marshall. “What was special about her was a love of life and she always had a smile.”

Marshall is honoring his wife’s memory by writing an autobiographical novel about their chemical journey and rediscovery of the periodic table of elements.

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