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You report the end of the Bronze Age in the eastern Mediterranean 3200 years ago has generally been characterised by its short duration of 50 years, mass migration of populations such as the Sea Peoples and abandonment of cities. In my view, the Sea Peoples were pushed out of their homes by plague etc. The …

Name and address supplied Thank you for David Ropeik's excellent and, for me, timely article on cancerphobia. I have just undergone treatment for breast cancer, including surgery and radiotherapy. I have deliberately limited the people who know, specifically because I couldn't face inaccurate, exaggerated, even hysterical responses. I am still working out how I might …

In your look at whether climate change is accelerating after a record year of heat, you cite models that predict a speeding up due to underestimates of the loss of the cooling effect of some pollutants. These are in decline as clean air policies take hold ( 11 May, p 14 ). The contribution of …

You review a new book on weight loss drugs that are taking off. Could these hold more promise than just reducing waistlines, one related to the link between food production and its impact on our planet? While many hope the drugs will make them slim, one side-effect could be that sales of fast food, highly …

How feasible are Dyson spheres, signs of which may have cropped up in a survey of 5 million stars in our galaxy? The basic engineering logic behind these proposed alien structures that encircle a star to capture all its energy isn't obvious ( 18 May, p 12 ). It makes sense that you would start …

The ridiculous idea of a Dyson sphere is truly a waste of space. Any industrial beings even 500 years in advance of us would have solved any energy needs without resorting to this silly and clumsy idea. Even our own struggles to develop fusion power in order to boil water to make steam to drive …

In my attempts to reduce my use of single-use plastics (refilling washing-up liquid bottles, using shampoo bars, toothpaste tablets and so on), I bought paper bags and greaseproof paper bags for packed lunches instead ( 11 May, p 36 ). Having just read your article on "forever chemicals", I am now wondering if I have …

Your reader Lawrence Ryan is worried that the concept that our reality is a simulation is lacking in parsimony and asks: "How much information would be required to simulate the lives, and inner lives, of more than 8 billion people?" But the simulation doesn't need to do any such thing. It only needs to simulate …

Thank you for your look at the ageing mindset. Although, at least according to this, I am already at the age when people start to acknowledge that they are old, I certainly don't feel that way ( 18 May, p 32 ). Maybe that is due in part to having a wide circle of friends, …

Your article reminds us not to stereotype all older people as frail, lonely or incapable. Ageism is one of many forms of labelling. Any group is in danger of that. It can serve a purpose by making us alert to specific needs, like offering an older person a seat on public transport. But when meeting …