Exploring the science behind hand weighing techniques

Emma Beddington’s article on the weight of human hands (14 August) was a fascinating read. I’m curious to know how she determined the values of 409g and 426g for the right and left hands without resorting to amputation. The only method I can think of is partial immersion in water and the application of Archimedes’ principle, but that would require a very specialized balance.

– John Pye, Southampton

Like the Jaffes (Ryanair charges elderly couple £110 after they download wrong boarding cards, 15 August), I also made a mistake in a travel booking. I booked my car onto the 02:00 Dublin to Holyhead ferry, but ended up joining the queue for the 2:00pm sailing. I was embarrassed by my error at check-in, but the officer reassured me by saying, “No charge. Don’t worry, I’ll get you on. We’re not Ryanair.”

– Michael Hudson, Lincoln

The shortage of dead flies, if they are to be used in the production of biodegradable plastic, will not only affect eccles cake bakers, but also the manufacturers of garibaldi biscuits.

– Marilyn Wilson, London

Regarding the digital divide (Letters, 14 August), at the public toilets located at the Great Wall of China, the toilet paper dispenser only releases its contents through facial recognition technology.

– Heather Bradford, Winchester

Jacqueline Wilson claims that younger readers lack “a sense of history” (Report, 14 August). However, how can they develop one if books are being rewritten, shielding them from past perspectives?

– Bridget Marrow, London

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