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Quick crossword #87: Strong cleaning agent such as NaOCl (6)

15 July 2021

Challenge your brain by solving New Scientist's weekly crosswords on your mobile, tablet or desktop

How big is the moon when seen through your legs?

14 July 2021

The moon as seen through your legs, plus a parasite fungus that sends insects on a sex spree and NASA’s Solar System Ambassadors, in Feedback’s weekly weird round-up

How we can all help grow trees in towns and cities

14 July 2021

There are many ways to help improve tree cover in towns and cities – even without a garden. Clare Wilson explains how

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?

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