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You note that "AIs get worse on simple questions as they get bigger" and that they have trouble adding two large numbers. Remember that Henry Ford built a great automobile company not by becoming an expert, but by drawing on experts ( 5 October, p 14 ). If AI can solve how to iteratively create …

Laura Spinney's article proposes the use of randomly selected citizens' assemblies to harness the creativity of the crowd to generate good solutions to public problems. The idea is a return to Athenian democratic principles, using new decision-making processes and new technology to shift governing decision-making closer to the general public than it is in current, …

There is no doubt that implementing the ideal of citizen participation is very challenging, but it is a shame that the country with probably the most effective system of direct democracy wasn't examined: Switzerland. The requirements for such democracy to work as mentioned in the article can all be seen in Swiss culture and its …

There is no need for digital technology to create true democracy for the people, by the people. Money corrupts politics. Make it illegal for vested interests to give money or anything that costs money to politicians before, during or after a term in office and watch those whose only interest is to enrich themselves run …

I favour the idea of a lottocracy because it would, in effect, eliminate those career-politicians who have rarely or never had a real job outside politics and so haven't experienced what it is like to actually have to work for a living. Some may also be subservient to their rich donors. Because of this, we …

If we make reality, are we part of reality or not? If we are, do we make ourselves – and all our thoughts, theories and so on? And if not, why not?

David Robson's piece on "frenemies" set up an intriguing question in my mind. Why is it that people I would really like to see again rarely cross my path, whereas those I would prefer to avoid appear everywhere I go? Some kind of negative attraction at play, perhaps? ( 19 October, p 40 )

Leah Crane's article about seeing Saturn through a telescope as a child and being inspired to love space was fascinating. It called to mind philosopher Bertrand Russell, who, although an atheist, freely admitted to the immense mystery of the cosmos: "We know very little, and yet it is astonishing that we know so much, and …

Many thanks for the Flint Dibble interview. It is no great surprise that multiple cultures would independently develop pyramids. We humans have a natural affinity for high places, probably dating back to spotting predators or enemies as well as a desire to be closer to the sky. ( 19 October, p 37 ) A pyramid …

The idea of extracting drinking water from the air, as deployed in a Florida children's hospital after recent hurricane disruption, isn't new. The Incas, living in mountainous regions too high to get rain, channelled dew into cisterns and may have used fog fences to collect moisture that was hanging in the atmosphere. ( 19 October, …