I am certain that my parents bought me this book because they were sick of me asking how everything worked; I was a child with a massive case of the "why?"s. Still am, really. This may have been the best purchase they ever made. I would sit around studying this book for hours. "That's how that works? I wonder how they discovered that! Maybe I can build that..."
This led to me nearly blinding my sister with my chemistry set - it was an accident, I swear! And essentially playing Choose-Your-Own-Adventure with the World Book Encyclopedia. And dissecting animals in Science Club in fourth grade.
Yeah, I was that kid.
I've graduated from washing machines and airplanes to the human body and nanotech and astronomy. But that's where it started - a big yellow book, almost as big as I was, that showed me how things are put together...