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Regarding the idea of covid-19 antibody tests as a means to see if vaccination has worked 13 March, p 10 . I was invited for my first dose of the Oxford/AstraZeneca vaccine on 13 February. I had already been tested for antibodies on 11 February. The result was negative. On 3 March, I took another …

One megaproject not mentioned as a way to fix the world for a trillion dollars is (relatively) cheap: buy all the right-wing tabloid newspapers 27 February, p 38 . Not a copy of each, but the entire businesses. Then either transform them completely or shut them down. They are to blame for much of the …

While I applaud Graham Lawton's desire to expose extinction deniers, I don't actually feel we should call time on the Tasmanian tiger, or thylacine, just yet 13 March, p 24 . Sure, over the years many people have sought to promote themselves by falsely claiming to have seen it, but the areas it may (or …

Carlo Rovelli states that quantum objects have no reality when they aren't interacting with other objects 13 March, p 36 . How do quantum objects not interact gravitationally with other things? Perhaps quantum objects are always real; it is just difficult to observe their gravitational effects. What's more, given the long wavelength of the photons …

Rovelli mentions the elegance of quantum theory without the usual wave function that it incorporates. He mentions an equation that was added to classical physics and that supports his take on quantum theory: xp – px = iħ, where x is the position and p is the momentum of the system, with the result depending …

Rovelli seems to claim that nothing truly exists, except in relation to other things. He is, I believe, attempting to provide a way of dealing with currently unanswerable questions arising from our observations at the quantum level, by saying that if there is no interaction with an object, the object doesn't exist. If the accepted …

If we assume that the chair on the cover of the issue featuring Rovelli's article doesn't exist, then we must also assume that he doesn't exist. If this is the case, then who wrote the article?

Further to the look at the decade since the Fukushima nuclear accident 13 March, p 18 . The UK government has commissioned nuclear plants at Hinkley Point, Bradwell and Sizewell, all on the coast and thus vulnerable to tsunamis. This is no idle speculation. Research published in 2001 found that volcanic activity on the Atlantic …

Among other interesting facts that Robin Dunbar mentioned in his look at the science of friendship is that people were unwilling to spend more than 30 minutes travelling to see a friend 6 March, p 36 . Were the population samples on which this claim is based drawn from a university campus or inner-city areas? …

Abigail Beall gave us a clear, logical explanation as to why day and night aren't of equal length at the equinox 20 March, p 51 . What seems illogical to me, though, is why spring and autumn start at the equinox – and, even more oddly, that the summer solstice is called midsummer's day and …