Fuelling the flight

As a new reader I am hooked on your scientific outlook and sharing of new research. But I

would have liked a bit more information about the XB-1 development (December, p20), especially given our current climate crisis.

I don’t see how encouraging resources and testing simply for passenger supersonic flight is a responsible thing to do. Yes, the technology is there. Yes, the aircraft look amazing. But is it worth the waste in fuel, the losses encompassed in supersonic flight? I think this is a case of seeing the bigger picture and understanding the world is not in need of another pollutant.

Ravina

Helping hedgehogs

I was very pleased to read your article about hedgehogs (December, p28) which others will, hopefully, use to help protect this lovely animal. I had one small question about feeding them, though. I’ve come across research that suggests mealworms are the cause of metabolic bone disease and should be avoided. Is this true?

Les Pallett

Despite much discussion online, there’s still no scientific link of hedgehogs being fed mealworms getting bone defects or other problems. But to be on the safe side, always offer food like mealworms in moderation, as a supplementary treat to the hogs’ wild diet. Ben Hoare, wildlife writer

Can Alexa really distinguish a baby’s sounds as well as a parent can, asks Tom Piccolo

The XB-1 craft is cool, but it’s another source of pollutants, says Ravina