Andrew Jackson Davis predicted the development of automobiles, typewriters, refrigeration, air conditioning, air travel, and many other modern technologies decades if not over a hundred years before they were developed, allegedly based on his communication with the spiritual world! He also came within 7% of getting the speed of light correct 94 years before it was finally calculated; many of his other claims may have been obvious superstition; however, there's no way an uneducated con-artist should have been able to get some of these things correct!