Is nothing constant?

Have you heard of the 'fine-tuning constant'? It's the thing that makes suns possible... It characterises the strength of the force between electrically charged particles. As such, it governs—among other things—the energy levels of an atom formed from negatively charged electrons and a positive nucleus. If it were a mere 4% bigger or smaller than… Continue reading Is nothing constant?


Seated at the mirror a woman puts herself in the hands of the hairdresser; very often a male. It is an occasion, almost ceremonial; it is concentrated, partly sombre. The woman is robed. Hair is the only changeable part of the face. And it is hair that frames - and makes distinctive - the various… Continue reading Hair