Player Handbook

“It is a curious but undeniable fact that the ruins strewn across the Numerian landscape, by which I mean the relics cast down from above during the Rain of Stars, host few if any examples of magical enhancement or gear. The only possible conclusion is that magic is simply not practiced on all worlds as it is here on Golarion. Whether magic is viewed as a strange superstition or simply can not function on these distant worlds is in large part irrelevant to an investigation of Numerian relics, of course. That these other worlds never unlocked the mysteries of magic and thus turned to technology and science to solve their worldly problems is the result, and these results now lie in Numeria for them open-minded to explore. These relics are capable of wondrous effects. Make no mistake–there is no magic behind science, but its potential may be just as great.”

−From Beyond Steel: The Mysteries of Numerian Science