There is an alternative way to convert from miles to kilometres, and vice versa, without having to multiply or divide (Letters, 3 August). The ratio of successive numbers in the Fibonacci series approximates to 1.6, so to convert from miles to kilometres you just need to move to the next number in the series, and the previous number when converting from kilometres to miles. Thus, 8 miles is approximately 13km; 20km (13+5+2) equates to approximately 12 miles (8+3+1). It may not be quicker, but it does help to while away long journeys.
Malcolm Myles-Hook
Whitchurch, Shropshire
• So Matisse’s art is hedonistic, he loved decorative artefacts and decorative women, and paid little attention to the cultural meaning of many of the articles he collected (Portrait of the artist as a hedonist with many blind spots, 1 August). Well, knock me down with a feather!
Lynne Corcoran
Lincoln
• Bell, Trudeau, Rowson are all brilliant, but today’s honours go to Nicola Jennings’ brilliant rendering of the Maybot (Opinion, 2 August). Round shoulders, stoop, sloping shoulder and all suitably dressed.
Peter Richards
Southend-on-Sea, Essex
• Is “Lionesses” quite the right name for the England women’s football team in its commendable efforts to achieve success on the pitch and eliminate sexism off it (Football, 3 August)?
John Bailey
St Albans, Hertfordshire
• Please. Robert Burns, yes. Rabbie Burns, OK. But Robbie Burns? No, never. (Robbie Burns falls from his pedestal…, 2 August).
Jackie Heaton
Glasgow
• Join the debate – email guardian.letters@theguardian.com
• Read more Guardian letters – click here to visit gu.com/letters
