I finished reading "The Teotihuacan Trinity: The Sociopolitical Structure of an Ancient Mesoamerican City" (2007) by Annabeth Headrick. Headrick approaches topics of Teotihuacan, such as their political system, concept of the afterlife, and how they view their cosmology, by analyzing their artwork and making comparisons with other Mesoamerican cultures. Despite the lack of much writing at Teotihuacan and the few murals that have preserved through time, Headrick makes a convincing argument on the numerous topics she discusses for the ancient Mesoamerican city. While new research is always coming out concerning Teotihuacan and Mesoamerica as a whole, her book has still held up ten years later.

I highly recommend reading this book.

I am reading the (new) Oxford World's Classics translation of Polybius' The Histories by Robin Waterfield. Polybius' goal for his work was to describe how Rome became a superpower. Book 1-5 of his work covers the Second Punic War, with extensive introduction that goes back to the Gallic sack of Rome.
Polybius also covers the problems of Egypt and the Seleucid Empire, and the Cleomean War and Social War in Greece in book 1-5, again, with introduction.
Furthermore, Polybius sometimes tells things that are unrelated to his goal, such as domestic struggles in Crete, or a detailed explanation for the waterflow in and out the Black Sea. As a sort of 'bonus', books 6, about the Roman constitution, and book 12, about how to write history, are also added.
These are the only books added in his book. Books 6-40 are incomplete: some books are preserved for up to 2/3, while others are (almost) non-existant. However, if all the partly preserved books were added, the book would be way too long.

I unfortunately don't have another translation of The Histories, so I cannot compare the book. The translation was pretty clear, even for me, for who English isn't the first language. Polybius likes to make very long sentences, and his word order was very weird, even for Greeks. In my opinion Waterfield did a very good job in dividing the sentences to make it readable.

The notes were clear and helpful. What also helped were the notes near texts where Polybius references to a earlier thing he wrote. These notes said where exactly Polybius wrote that, for if you forgot about a detail. There is also a glossary which explains words that are impossible to translate, such as a certain type of small ship, or words like 'praetor', or 'manipel'.
There are also textual notes included, which points out lacunas in the Greek text, and also points out which version of the Greek text the translator used.
I really liked the long introduction of 30+ pages about Polybius and his work. The introduction also includes a small summary of each book.

The downsides are that the paper is pretty thin, which makes it bend/fold easily. Also, on each page there is one line of text which is lengthened or cropped vertically. This makes it a bit annoying to read.
There were also pretty few maps: one of Greece, one of Italy, and one of the entire Mediterrenean. I would like to know where smaller cities lied, to trace the routes of armies better. However, I think more translations of classical books have this problem.