Science + Letters

Letters: The Nidus haemodialysis device has undergone a successful clinical trial, but there is a lack of funding to get it through regulatory approval, write Dr Heather Lambert and Dr Malcolm Coulthard

Letters: Dr Nick Crumpton and Paul O’Shea respond to an article by Isabel Losada on teaching young people about ‘real, living’ animals, instead of dinosaurs and unicorns

Letter: Prof Roger Bayston responds to a long read on the difficulties facing drug and device development

Letter: The size and abundance of chicken bones in strata don’t herald a precisely defined ‘start’ of the Anthropocene, says Matthew Edgeworth

Peter Forbes writes: Tim Radford remained someone completely without pretension.

Letters: At least some sightings of unidentified anomalous phenomena (UAP) may relate to non-human intelligence, says Prof Michael Bohlander. Plus, letters from Andrew Robinson and Aideen Carty

Letters: Dr Tom McClelland on the consequences of AI consciousness, Michael Webb on protecting creative industries, and Prof Virginia Dignum and Prof Wendy Hall on the need for a global regulatory framework

Letter: If someone is rebuffed, they may not offer a second time, writes Barbara Foster

Brief letters: Swaledale’s rainbow nights | School report | Death’s double | Weak coffee

Brief letters: DeepSeek’s home | Bare bones | Liquid lift-off | Labour faithfuls? | School sports | Questionable teaching

Letters: A number of companies have been able to make these low-energy nuclear reactions work reliably, write Brian Josephson, David J Nagel, Alan Smith, Dr Jean-Paul Biberian and Yasuhiro Iwamura