The concepts of determinism and freedom are nicely illustrated in a philosophical problem originally invented by William Newcomb, a California physicist. The philosopher Robert Nozick published an analysis of the problem in 1969, and since then it has been widely discussed (Nozick, 1969; Gardner, 1973, 1974, 2001; Drescher, 2005, Chapters 5 and 6; Mark in Malaysia, 2009, summarizes the issues on his webpage).
The basic problem is to decide how to act in the following situation. There are two boxes. The first contains $1000. You can see inside this box: the money is certainly there. The second contains either $1,000,000 or nothing. You cannot see inside this box. You can choose (i) to take both boxes or (ii) to refuse the first box and just take the second. A superior being predicts how you will choose and, before you do so, places in the second box either $1,000,000 if it predicts that you will refuse the first box, or nothing if it predicts that you will take both. The choice must be deliberate: it cannot be made on the basis of some random event such as a coin toss. How do you choose – one box or two?