This week’s new questions
14 July 2021
A rainbow is composed of a continuous spectrum of wavelengths of light, so why do we see it as discrete colours? And what would Earth be like if life had never existed?
14 July 2021
A rainbow is composed of a continuous spectrum of wavelengths of light, so why do we see it as discrete colours? And what would Earth be like if life had never existed?
14 July 2021
Are the tannins in tea really tannins, asks one reader. And what about fluoride levels in cheap tea?