In May, a group of about 40 people stood in a circle deep within the Pyramid of Khafre, the second-largest of the three pyramids looming over Egypt’s Giza Plateau, holding hands and praying for Earth. Suddenly, their tour guide, an American mathematician and author named Robert Edward Grant, collapsed.

He later described the experience in an interview with WIRED as a full-body electric shock emanating from somewhere beneath the chamber’s stone floor. “I felt electricity coming through my hands,” he says. “People were touching me, [and] they would feel it, too.” (Three eyewitnesses who were with Grant inside the chamber confirmed to WIRED that he fell to the ground; one of them, who rushed to help, said Grant's hand felt warm, but he didn’t feel anything like electricity. Grant also has a

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