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Wearables meant to boost mental health sound like a nightmare. With these, I wouldn't be allowed to drift off to sleep thinking about what I want to think about – I plan the next day: where am I going for my walk, what am I having for dinner, etc. But that would bring a storm …

The pigeons in Aperture ( 25 January, p 26 ), clockwise from far left, are a Franconian Trumpeter, Danish Suabian, Old Dutch Capuchine, Gimpel (or Archangel) and Jacobin.

Like Bethan Ackerley, I am completely hooked by the TV drama series Severance . People I have discussed it with are mostly horrified by the concept of workers having their brains altered so their office/home life memories are strictly partitioned, but I confess that I can see the attractions ( 25 January, p 30 ). …

Even if depression isn't caused by low serotonin, as Joanna Moncrieff sets out in the book you reviewed, I am glad to see some researchers have pointed out that this doesn't mean SSRIs, drugs commonly used to treat it, are ineffective ( 18 January, p 28 ). In my view, the most obvious explanation for …

When it comes to the importance of our sense of smell, perhaps the majority of the taste of food and drink is predicated upon the aromas we experience before and during the act of consumption. This is why anosmia can lead to nutritional deficiencies, when all food seems too bland. In fact, one could argue …

Disappointingly, due to the disruptive effect of lighting, sleep experts discourage reading in bed, which no doubt many find the only time for this enjoyable pursuit. Perhaps the best solutions are ebooks with a blue-light-blocking mode or the audio version of New Scientist . In the latter case, a potential problem is the highly worrying …

Rocket launches are deemed environmentally OK if hydrogen is used as rocket fuel, because it doesn't add to the carbon dioxide burden. However, the world must cut the total energy it consumes, and so any non-fossil fuel, such as hydrogen, ought to be used to replace fossil fuels in everyday life, not for a new …

Harm Schoonhoven raises the concern that people in a Mars colony would never be able to return to Earth. This eventuality was covered by The Hitchhiker's Guide to the Galaxy . In essence, its message was that those chosen to colonise a new world are those the home planet never wants to see again. Could …

While the idea that the possible underlying structure of space-time could be to do with a strange geometric entity is fascinating, I suggest this raises another issue for many: the impossibility of comprehending the reality behind such descriptions ( 25 January, p 10 ).

I always found it hard to believe in the many worlds version of the multiverse that is proposed to explain quantum behaviour ( 11 January, p 32 ). In essence, it says that a person, living on a tiny speck in the universe, measuring an even tinier subatomic particle that was in superposition, would create …