Here in London we’re bracing ourselves for what could be a couple of the hottest days on record, with daytime temperatures forecast to hit 40C. Of course, these are levels that many other parts of the world are used to dealing with amid the climate emergency. And sustained hot spells have been more common across northern Europe in recent years.

So, commuters are again being encouraged to work from home, avoiding steaming underground rail lines, and schoolchildren are being given the chance to do half-days in the classroom. But what of the night? In a region where houses are built for cooler weather and few have air conditioning, a common refrain is: “How are you sleeping in the heat?”

Those of you in warmer climes might warn to send us some tips, because it seems the northern European nighttime temperatures have risen faster than those in daytime. Why? Stephen Burt, of the University of Reading, explains.

Stephen Khan

Executive Editor, The Conversation International

Too hot to sleep? Nights are warming faster than days as Earth heats up

Stephen Burt, University of Reading

The strongest signal of our changing climate flares while most of us are asleep.

Vegetarian diets may be better for the planet – but the Mediterranean diet is the one omnivores will actually adopt

Nicole Allenden, University of New England; Amy Lykins, University of New England; Annette Cowie

Vegetarian and vegan diets are the best for the planet. But most omivores simply won’t switch to them. It’s realistic to promote the Mediterranean diet instead.

A cosmic time machine: how the James Webb Space Telescope lets us see the first galaxies in the universe

Sara Webb, Swinburne University of Technology

Why is the universe 13.8 billion years old, but 93 billion light-years across? It’s all about how light travels through the cosmos.

En español

Dora Maar, la gran fotógrafa oculta tras la musa

Amparo Serrano de Haro, UNED - Universidad Nacional de Educación a Distancia

Dora Maar (de cuyo fallecimiento se cumplen ahora 25 años) fue una destacada fotógrafa, tanto en los campos del retrato social como del surrealismo. Sin embargo, su obra se ha visto ensombrecida durante décadas por el hecho de haber sido pareja de Pablo Picasso.