“Back in medieval times, " I said, "we used oil of vitriol for its healing properties. No doubt that's why Commodus had some in his infirmary. Today we call it sulfuric acid."Meg flinched. "Isn't that dangerous?""Very.""And you *healed* with it?""It was the Middle Ages. We were crazy back then.”

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About Rick Riordan

American novelist and educator, Rick Riordan is best known for creating the Percy Jackson series, which blends mythology with contemporary coming-of-age stories. His work has introduced generations of readers to Greek, Roman, and Norse mythology through accessible, engaging narratives.

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Books by Rick Riordan

The Lightning Thief

2020

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The Sea of Monsters

2007

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The Last Olympian

2011

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The Battle of the Labyrinth

2009

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The Titan's Curse

2007

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