Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I'm disappointed

Wow, this is a brief presentation! Einstein's theories of relativity (both special and general) get four pages -- and this includes a bio. The period from Plato to Kepler (about 2000 years) gets all of fourteen pages. I can only assume we're supposed to know all this stuff already, because one couldn't become more than introduced to names given the author's treatment of the topics. On top of this, many "facts" are plain wrong. E.g., the author claims that Hans Bethe knew nothing of his name's addition to the famous Alpha-Beta-Gamma (Alpher-Bethe-Gamow) paper (p. 61). Not true.There are many much better presentations of this material; for one, see Singh's _Big Bang_. It's better researched and a lot more thorough.