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Michael Marshall's piece on non-fiction science books that aren't fact-checked had me nodding faster than a windscreen nodding toy. I work as a writer and editor and have been a journalist, so I understand and value objective truth and the importance of fact-checking. If you read Richard Dawkins, Stephen Hawking and Carl Sagan (among many …

The idea that we should strive to find more effortful leisure pursuits won't suit everyone ( 5 October, p 39 ). Many of us have very physically or mentally effortful jobs and some, sadly, don't particularly enjoy much of that effort. The last thing they need is to feel guilty for decompressing with TV, music, …

I have three easy tests for whether artificial intelligence has become our scientific equal. It should be able to instigate research, get a paper accepted for publication and, lastly, win, or get nominated for, an Ig Nobel prize. This last task needs an understanding of humour, irony and, sometimes, double entendre ( 19 October, p …

The havoc wrought by feeding farmed fish with wild-caught fish could be eliminated if industrial-scale insect farming were used to provide the feed instead ( 26 October, p 16 ). While convincing people to eat insects is an uphill struggle, it is relatively straightforward to get them to do so indirectly if they are "transformed" …

Roger Morgan worries that citizens' assemblies can become self-selecting due to large-scale refusal to participate, and hence polarised. The simple solution to this, hinted at in the original article, is to make participation compulsory in the same way that jury duty and, in some countries, voting are, allowing for rare exceptions due to personal circumstances. …

In your look at ways to create direct democracy by the people, for the people ( 5 October, p 32 ), Laura Spinney ascribes scientific and philosophical achievements of ancient Greece to such a system. However, science has also flourished under caliphs, tsars, queens, popes and emperors. In addition, a problem with direct democracy is …

What an amazing image of Shackleton's ill-fated ship Endurance. The preservation is astonishing compared with that of Titanic. Endurance sits on the seabed at a depth of 3008 metres compared with Titanic at 3800, so both very deep and cold, but the former appears to be in much better order with few signs of steel …

When it comes to fermented food, Isabelle Savary-Auzeloux recommends finding a trusted source and cautions against the do-it-yourself route. That will seem strange to people in South Korea and other countries where traditional fermented food is routinely made at home ( 2 November, p 39 ). Like most home-cooking techniques, fermenting requires some care to …

I see inherent self-contradiction in Daniele Oriti's statement that "we make reality". This is to claim to know reality. It is akin to saying that "there is no truth in words" ( 12 October, p 40 ). Science advances roughly in step with our ability to make measurement. We have had only a few centuries …

When it comes to trying to tap into sleep's twilight zone – those moments between being fully asleep and awake – I have been using a simple variation of the Thomas Edison metal ball system in the form of a book, which wakes me suddenly when it falls out of my hands while reading in …