The early 20th century saw the peak of the spiritualism movement, and one of the biggest names to come out of that movement was Edgar Cayce, also known as the sleeping prophet for the way he fell into a trance-like state while performing his readings.
He claimed to connect to a kind of universal superconsciousness in this state and made predictions about the future, some of which seemed to eerily come true.
Although, of his more than 14,000 predictions, there are also some very out-there ideas about Atlantis coming back and death rays.
Cayce still has adherents to his prophecies to this day, though much of his work has been discredited by skeptics like James Randi.
Either way, Cayce shaped the way a lot of people thought in the 20th century.