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What is the current status of the conjecture? I am interested in all possible aspects, counterexamples, attempts to formulate it in a mathematically rigorous way, proves in special cases, opinions, expectations and so on. Of course I have been trying to find information and have seen some things but the searches give a lot of useless links so I was wondering if anyone knows where to look. Overview articles would be great, the one that I am aware of is Penrose (1999).