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Regarding negative attitudes towards ageing, even though I have a heart health condition, I hardly ever think of myself as old. I'm 64, but even before I was 28, I always had that specific age in my mind, and so I routinely think of myself as being 28 years old ( 4 April, p 19 …

Referring to mentions of time in recent editions of ¿ìè¶ÌÊÓƵ , I would like to offer an opinion. The spatial dimensions of north, south, east and west define an object in instant space but, as virtually all matter is in constant relative motion, there is a need to measure change between events caused by …

Stone Age seafarers had a good understanding of local conditions, wind directions and the local geography, without having the use of compasses. I would suggest that although it would have been difficult to find Malta from Italy, it would have been much easier to find Italy from Malta. It required only one sailor with sufficient …

With a number of jurisdictions proposing social media bans on young people, may a retired secondary school principal offer a comment? Don't announce a regulation until an effective means of enforcement is in place. Most importantly, never underestimate the ingenuity of teenagers ( Letters, 11 April ).

The children pictured are playing chess (25 April, p 32)

First, it was Y2K. Now, it's proofing the security of our technology against quantum computing (well covered by Karmela Padavic-Callaghan). Both challenges continue to add evidence that ignorance, wilful or otherwise, isn't bliss in cyberland ( 25 April, p 10 ). However, perhaps one change we can make is to demote the language we assign …

Matthew Stevens rightly points out that, in a few millennia's time, it will be difficult to read nanometric information etched into glass, given that, by then, the necessary reading technologies will probably have been forgotten. But there is a very simple solution: engrave th information onto the glass, but then carve the instructions for building …

Thank you for your excellent article about Chernobyl. I was involved with a safety case for a new building at Sellafield in 1986 when the accident happened. I always wanted to visit, and in 2018 I was lucky enough to visit the site and see all the most interesting aspects as described by your reporter …

The chimpanzee civil war has been held to show war as a pre-human activity, but is civil war the same thing as war? It may be argued that war defined the start of civilisation: one group of people reacting to another in opposition and possibly cooperating with others. Surely civilisation was when humans realised they …

Concerning David Robson's piece "Why is it so hard to change your mind?": like many people, I'm extremely open minded ( 25 April, p 17 ). I'm willing to listen to anyone's point of view, even though I know they're wrong!