In our age of techno-utopianism, we are routinely told in crypto-religious terms about the coming “Singularity” – the creation of superintelligent, conscious machines. One problem with superintelligent conscious machines, however – as SF writers down the ages and some modern philosophers agree – is that they might very well choose to destroy all humans. How to stop the godlike robots wiping us out? The best way, Smart suggests, might be to give them a dose of digital LSD to force open their doors of perception.

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