So the fossilised jaw of a rhomaleosaur that Matthew Myerscough discovered is 201 million years old (Report, 28 July). Such precision. It reminded me of the old story of a museum guide telling a visitor that a similar exhibit was 100 million and 27 years old. When asked to justify this, he said: “When I started work here I was told that it was 100 million years old and I have been working here for 27 years.”
Alan Woodley
Northampton
• Regarding hair washing (Letters, 26 July), I lost my shampoo en route to spending two months in South Sudan and refugee camps in north Uganda and Kenya. In the absence of shops, I just used soap to wash my hair. When I got back in the UK, I visited my hairdresser. “What have you been doing to your hair?” she asked. “I’ve never seen it in such good condition.”
Maggie Hamilton
Oxford
