Showing results by author "Tracy Vonder Brink" in All Categories
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More Precious than Gold
- By: Tracy Vonder Brink
- Narrated by: Dan Schoeneberg
- Length: 4 mins
- Unabridged
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Aluminum was once more valuable than gold. A breakthrough in refining aluminum from rock transformed it from rare matter to sandwich wrapper. In this science story, you'll learn how two chemists, Charles Hall and Paul Héroult, solved the problem.
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More Precious than Gold
- Narrated by: Dan Schoeneberg
- Length: 4 mins
- Release date: 10-10-2024
- Language: English
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The Man Who Built a Better Leg
- By: Tracy Vonder Brink
- Narrated by: Dan Schoeneberg
- Length: 8 mins
- Unabridged
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Injured by a cannonball, James Edward Hanger was the first amputee of the Civil War. Determined to find a better solution than a peg leg, he worked to develop his own artificial limb company. He even continued working past retirement, providing Hanger Limbs for victims of World War I.
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The Man Who Built a Better Leg
- Narrated by: Dan Schoeneberg
- Length: 8 mins
- Release date: 10-10-2024
- Language: English
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$0.99 or free with 30-day trial
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