This chapter primarily discusses the second revolution that occurred in the early 1900s, that is of the quantum theory. The point in the book that I found most interesting is the same as the one that Einstein found most difficult to accept, that is of the lack of locality of the universe. This lack of locality is refered to as entanglement. I feel that entanglement can be best pictured using light bulbs that are seperated by a great distance, but turn on at the exact same moment in time.
The lack of locality in the universe does not preclude the possibility of their being definitive properties for specific particles. Additionally concepts discussed in chapter 4 are those of probability, in that you can never same that something is exactly at a given point without affecting the particle, thus you can only state the most probable location for the particle without changing the particle though the act of measuring.
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