Leif Ristroph is an experimental physicist and applied mathematician who specializes in fluid dynamics at NYU. His team has been experimenting with the creation of yardangs, organic formations through natural erosion. Their work has led to the theory that the Sphinx may have been shaped by natural forces before humans finished the job and created one of the most famous landmarks of the ancient world.

This episode of Unlocking the Past with Eric Erickson is brought to you by History's Trainwrecks and the bestselling book, How To Start A Podcast in Less Than A Day. Also look for Virginia Dare and Ascension, available now.

Bill Haroldson is a historian and president of the South Whidbey Historical Society & Museum. The area is host to a legend of a mysterious shipwreck that some have claimed to pre-date the arrival of Captain Vancouver while others have debated its very existence. Haroldson discusses the history of the legend and his theory that it might be tied to a ship that disappeared in the mid-1800s, said to have met a violent end after the Point Elliot Treaty.

This episode of Unlocking the Past with Eric Erickson is brought to you by History's Trainwrecks and the bestselling book, How To Start A Podcast in Less Than A Day.

Dr. Terry Hunt is a professor at the University of Arizona and considered one of the leading experts in the field of Rapa Nui and the iconic Moai heads located on the island. His work has changed the way people look at the history of the island and how the statues were created and placed. He is the author of "The Statues That Walked: Unraveling the Mystery of Easter Island," co-authored with Carl Lipo, detailing Rapa Nui's ancient history.

This episode of Unlocking the Past with Eric Erickson is brought to you by History's Trainwrecks, Drinks with Great Minds In History, and the bestselling book, How To Start A Podcast in Less Than A Day.