Buying a book, "read to me", and reading on a bus

I was reading something (yes, on the Kindle) and it referened Joseph Conrad's Heart of Darkness.  So I hit the Kindle store and they had it for $0.00 - yep! Free.  Below it they listed several other free things I might be interested in.  So I had to "buy" Heart of Darkness".  But then it wouldn't take me back to the previous page to look at the other suggestions.  I had to search for "Heart of Darkness" again to find the other books it recommended.
Not very friendly.  But it did work.

Pressing the "Menu" button should bring up the dictionary.  Doesn't matter if I'm in a "book" or a PDF file.  Let me pull the dictionary up any time.

I also figured out how to turn on the "read to me" feature.  Better yet, I found the controls to slow it down and switch the voice.  It took me a while to figure out how to adjust the volume.  (physical buttons on the side of the unit, how could I miss that?) I was trying to do it with the control stick/mouse thing.  So I read along while the Kindle read out loud on a bus trip.

A comment about that - if you are going to read in a moving vehicle, make sure it's an ebook and not a pdf.  Then you can make the text nice and big to compensate for the jiggling of the bus.  On the way back, I turned on the tiny little light above my seat and I could read the screen.  Amazingly well, actually.  But I didn't actually read, I was too tired.