Question

Hello and blessings!
On page 148 you described Einstein’s thought experiment. You wrote there: “From the perspective of the observer attached to the railcar, he and the ball will indeed arrive together at point B.”
A. I would appreciate clarification of that assumption. Why, really, would the ray of light arrive together with him at point B at the same time? I simply didn’t understand.
B. It seems to me there is a mistake there, and instead of “and the ball will indeed” it should say: “and the light,” right? The ball belongs to the previous experiment, and the word “indeed” has no meaning.
Page 327:
You described the difference in effect between faces whose right half is smiling and those whose left half is smiling, and you wrote: “From this it follows that the right-hand illustration (there in the book) expresses more joy, since there the smile is picked up by our left eye (after all, we are standing opposite it).”
That is not precise, as far as I know, and as appears in the link you mentioned there (on p. 326): the left side of the face of someone standing opposite us is indeed processed in our right hemisphere, but that is not because it is picked up by the left eye.
The eyes pick up what is in front of them in alternation. To illustrate: if four circles appear before me in the order A, B, C, D, then the right eye will pick up A and C, and the left eye will pick up B and D. The brain’s processing will come out differently, so that the right side of the brain will process B and D, and the left side A and B.  
Therefore, in my humble opinion, instead of writing: “From this it follows that the right-hand illustration (there in the book) expresses more joy, since there the smile is picked up by our left eye,” it should say: “From this it follows that the right-hand illustration (there in the book) expresses more joy, since there the smile is processed in the right hemisphere.” Correct?
 
Thank you very, very much, and have a good week!