In the first chapter of the Book of Ether in verses 6-32, we read a list of 30 names. This list is the genealogy of Ether to Jared:
Ether, Coriantor, Moron, Ethem, Ahah, Seth, Shiblom, Com, Coriantum, Amniqaddah, Aaron, Heth, Hearthom, Lib, Kish, Corom, Levi, Kim, Morianton, Riplakish, Shez, Heth, Com, Coriantum, Emer, Omer, Shule, Kib, Orihah, Jared
What is incredible is that the rest of the Book of Ether gives an account of these same 30 people but in the reverse order. Beginning in chapter 6 verse 14 all the way through to chapter 11 verse 23.
If Joseph Smith dictated the Book of Mormon without referring back to previous content or looking at any notes, how did he manage to do this? Simply reciting a list of 30 names backwards is impressive on its own, but including them into a coherent storyline is quite another.
How could Joseph Smith hold so much information in his memory?