Last 1 I really enjoyed was "Inherit the stars" (1977) by James P. Hohan. A good syfy book revolving around finding out how an a man in a spacesuit ended up on the moon ~50 000 years before he should have been able to. Theres also a manga version of the series being made, although I do recomend the book instead (Less things omitted/changed).
There are a few points that dont add up, but you have to remember that the book was published in 1977 (written earlyer) and our knowledge has improved in the meantime. Some of these inconsistencies are explaned in the sequels. Still they dont ruin the book and you might miss them altogether.
The second book in the Giants series (cant remember the title) was decent aswell.
Anyone else enjoy reading eBooks using text-to-speech? Or is that cheating?