Too Hard for Science?: Asking scientists about questions they would love the answers to that might be impossible to investigate

Welcome to a new regular feature called “Too Hard for Science?” The idea here is to interview scientists about pet ideas they would love to explore that seem impossible to investigate in real life. Perhaps they involve machines beyond the realm of possibility, such as particle accelerators as big as the sun; perhaps they would be completely unethical, such as lethal experiments involving people; perhaps they would be too expensive, or require centuries to run, or could never find volunteers to participate, or are in some way unprovable. [More]

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Too Hard for Science?: Asking scientists about questions they would love the answers to that might be impossible to investigate