I'm a little frustrated by this book. To the author's credit, it's called Einstein for Dummies, not E=mc sqd for Dummies. So, I put aside my annoyance that there was a lot of text to get through before you get to the explanations of the special and general theories of relativity, or anything to do with quantum mechanics.
At first, I got frustrated because Calle kept making statements (about mechanics, light, relativity, etc. ...) but nothing was explained. All it did was make me think over and over, "But how, ... why? After a frustrating slog through too many pages, I realized I ought to skip ahead because there were chapters later on that did a deeper dive into the two relativity theories and then the quantum theory.
So, I skipped to Page 111. I recommend this to anyone who picked up this book for the same reason I did - to understand those three things. Actually, I recommend skipping further - go to Page 124. Maybe.
Even in Part III: The Special Theory of Relativity, I'm frustrated by the non-for-dummies way this book is written.
E.g.:
"If light traveled through the ether, the Earth did as well. And if the Earth were moving through the ether, the speed of light would change. When the Earth moved in the same direction as the ether, it would gain some ground on the light beam, and you would measure a smaller value. When the Earth moved in the opposite direction in its orbit around the sun, you'd measure a larger value for the speed of light, because you'd be losing ground."
That's just not very effective at teaching "Dummies" anything.
The author had explained that scientists named the substance that light travels through "ether". We're told that they thought light traveled at 300,000 km per second. How would the Earth "gain some ground" on the light beam in that hypothetical? I think what he means is simply that the backwards velocity or whatever its called - the rate of expansion of the gap between the two would decelerate. Or something. But to write that it would "gain some ground" is confusing and not helpful. It made me feel like a dummy. Like I must be missing something. So I drew diagrams.
I'm going to keep working at this book. If it gets better, I'll update my review. Regardless, there are too many sentences, paragraphs, and sections of this book that are not helpful at all in trying to understand Einstein's theories.