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Your article contrasting two types of leadership – prestige and dominance – emphasised style over substance ( 4 July, p30 ). Someone's past and promised actions and agenda are important criteria when people consider that person for leadership. I would hope many would reject a leader who denied science, vilified immigrants and placed children in …

In "How to sit", the authors suggest that squatting might maintain enough muscle activity to prevent triglyceride build up and lessen risk of cardiovascular disease ( 18 July, p28 ). They cite the Hadza of Tanzania as an example. The Hadza diet is very fibre-rich. The microbiomes of individuals have been studied and they have …

The problem with how many of us sit may be a desk or table problem. If we are to squat on the floor to improve health, we would need desks that are much lower.

You list places where the virus has almost been eliminated, including Iceland, Taiwan and New Zealand ( 25 July, p10 ). In Western Australia, the virus has been eliminated too – the few cases are inbound travellers who are in quarantine. As a result, life has returned to near normal. The hard lockdown of the …

To avoid a coronavirus resurgence, the UK should follow the guidance of the World Health Organization and test more widely ( 18 July, p7 ). How about testing everyone every week and quarantine under supervision anybody who tests positive? I estimate this could be done for about 2 per cent of the cost of furloughing …

You have lately had some great articles by giants in the cosmology field, including Jim Peebles admitting that there are huge gaps in our understanding ( 6 June, p30 ). As a biologist, if I had to review results that required fudge factors in the way cosmology does (dark matter and dark energy, both lacking …

Andrew Wight was the author of the article on links between drug cartels and deforestation in Guatemala ( 11 July, p17 ). Teijin is Elitac's partner company in developing a vibrating belt for navigation use ( 25 July, p15 ).

In answering the question "Why are we getting heavier", one possible answer was missed. We expend energy just to maintain our body temperature. In the UK, this is usually to keep warm. With improvements in home heating, this demand on our bodies' energy consumption has been reduced. Have the habits of how much we eat …

Christine Duffill argues that a second wave of coronavirus might not be as bad as the first ( Letters, 18 July ). Not because people that have fought it off will be immune, but because they have fought it off easily the first time, so will do so again. Sadly, this isn't at all certain. …

You list people being indoors and in close proximity as factors in coronavirus "superspreading" events ( 8 August, p 10 ). A further factor is another typical behaviour at social events: the raising of voices at close quarters to make yourself heard. To stay safe, as the noise of conversation rises in a room, leave, …