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?
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Premium
Is there any harm in drinking too much tea? Part 2
14 July 2021
Are the tannins in tea really tannins, asks one reader. And what about fluoride levels in cheap tea?
If sitting cross-legged is bad for us, why is it so comfortable?
14 July 2021
Bad? It’s the default sitting position for many people and can help the spine, say readers
How fast should I cycle to avoid punctures?
14 July 2021
The best speed for avoiding a flat bike tyre depends which kind of puncture you’re talking about – and if you’ve adopted the “bum off saddle” post, according to readers
