Letter: For the record – 13 October 2018

• Thirsty work: the power consumption of Neal Tai-Shung Chung’s desalination plant is 1 kilowatt-hour per cubic metre of water (8 September, p 32).

• Heavy. The quasar called OJ 287 has the mass of 18 billion suns (22 September, p 35).

• The female physicist we pictured at New Scientist Live is Melanie Windridge (29 September, p 24).

• The muscles that control Ian Burkhart’s hand and fingers are stimulated through a sleeve on his forearm (29 September, p 7).