"A world of swords and magic is no match for modern technology!"

The protagonist, an engineering student, woke up as a baby. He found himself in a world of swords and magic fantasy—a world where magic existed, phenomena that were difficult for the completely rational science-minded protagonist to understand. Magic? What about the law of energy conservation? What is that magical flame burning? Carbon? Where did it come from? Ugh, if a phenomenon exists, there's nothing to be done about it—I'll figure it out and use it! Earth's technology is the greatest in the universe!! By fusing engineering knowledge from his original world with magic from this other world, he will use modified technology and weapons to bring about a revolution in this other world...perhaps. Eventually. The interludes are basically character development and setting explanations. You can skip them without affecting the main story.