Part 1- 2001 Space Odyssey

I have just finished part 1 in the novel 2001 Space Odyssey. Part 1 was mainly about how man came to be. It started with Moon Watcher and his tribe struggling for existence. Then a big crystal apeared outside Moon Watchers cave. It taught them how to hunt and become more cordinated. Moon Watchers tribe by the end of part 1 ends up crossing the river that seperated his tribe and the opposing tribe. Moon Watcher crosses this river and kills the opposing tribes leader. Then the book describes how man changes and came to be.
So far i like this book. It is pretty interesting how it starts in the beginning of mans existence. I think the crystal that taught Moon Watcher and his tribe is related to extra terestrial help or the Ancient Alien Theory. That theory is that aliens helped man throughout there existence to help them survive. But this is only a guess. So far i am very pleased by this book.