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I was pleased to see the brilliant interview with Mark Carney 20 March, p 44 . I wish he was still governor of the Bank of England, as he could perhaps persuade the UK government that we need a better carbon-pricing mechanism, like the carbon fee and dividend policy of Canada. This involves introducing an …

I was disappointed with the interview with Carney, though I suppose I shouldn't have been; after all, this was a capitalist offering capitalist solutions to numerous capitalist problems, of which climate change was but one. The piece contained a number of concepts meant to address climate change that contributors to Â鶹´«Ã½ , both staff …

Your article suggests that biological age can be influenced by your state of mind 20 March, p 36 . I agree that a positive outlook is beneficial, but would add that autosuggestion can also be useful. When I turned 70, I decided I would rather be 35. I now think of myself as 35, and …

You report strong evidence of a correlation between mental attitude and biological age, but is there any evidence of causality? Causality in the other direction is plausible: if your physical and mental fitness is good, you are likely to feel younger, and the converse likewise.

It is unfortunate that an approach agreed by all of England's regional health directors and supported by the World Health Organization – vaccinating the most at-risk people against covid-19 first – is constantly challenged and politicised ( Letters, 3 April ). When vaccines are limited, choices have to be made as to how to get …

There is a common misperception that the UK has only had two waves of SARS-CoV-2 when in reality it has had three so far ( 3 April, p 9 ). There are three peaks in the graphs showing infections, hospitalisations and deaths. Waves one (April 2020) and two (November 2020) were caused by the original …

In his look at time, Julian Barbour states that "we have no choice but to be swept from past to future" ( 6 March, p 46 ). I propose a line of thinking where we aren't swept from past to future, but that time passes by us, as "observers", in the reverse direction – from …

There is more to add to your piece on nature and mental health ( 27 March, p 36 ). First, protected areas worldwide have an economic value in terms of mental health, estimated by research that I was involved in at US$6 trillion per year . Second, national parks and other biodiverse ecosystems improve mental …

How would you feel if you were in a quantum superposition, asks Carlo Rovelli in his article "Why quantum is relative" ( 13 March, p 36 ). That is easy enough to answer. I am in a superposition every Friday night, having played the lottery but not looking at the results until Saturday morning. On …

The article about the possibility of a small, primordial black hole in our solar system makes me wonder: could it be responsible for the Kuiper belt, in the same way that the Sun-Jupiter Lagrange points seem to be responsible for the placing of the asteroids? ( 3 April, p 34 )