I Don’t Really Get It, but It Looks Like I Was Reincarnated in Another World

A brief description of the manga I Don’t Really Get It, but It Looks Like I Was Reincarnated in Another World: “I’m cute, but in a past life I was a middle-aged research scientist!”
Orphan Ren was sold and was riding in a wagon when the accident happened. After an unfortunate incident, memories from a past life returned to her! “I was … a grown man!”
Well, yes, she was a scientist in his thirties who died in a blast in the laboratory. After being reborn, she lived like an orphan girl! Ren will use his talents in magic and knowledge in science to survive in this harsh world and escape from the merchant who bought her! The story of how to survive in another world with the help of magic and science!