In 2021, mine workers in Morocco made a huge discovery. They found a fossil that scientists believed to be a new species of mosasaur – a large swimming reptile that lived in the same era as the Tyrannosaurus Rex. However, many scientists, including a group in Alberta, are now questioning whether the fossil is real or fake.

Ivan Semeniuk is The Globe’s science reporter. He’s on the show today to explain what we know about this fossil, the feud that it’s provoked between paleontologists and when we might uncover the truth.

This episode originally aired May 30, 2025.

Questions? Comments? Ideas? Email us at thedecibel@globeandmail.com

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