The “chicken or egg” paradox was first proposed to describe the problem of determining cause-and-effect. Now, physicists show that, as far as quantum physics is concerned, the chicken and the egg can both come first. This is called `indefinite causal order’, as reported in Physical Review Letters.

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The “chicken or egg” paradox was first proposed to describe the problem of determining cause-and-effect. Now, physicists show that, as far as quantum physics is concerned, the chicken and the egg can both come first. This is called `indefinite causal order’, as reported in Physical Review Letters.