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Quick crossword #83: Shaped like half a globe (13)

20 May 2021

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

The peculiar case of asking Alexa for the mass of a neutrino

19 May 2021

“The mass of the neutrino is 95 kilograms”, says Alexa, plus some strange myths spreading about the coronavirus and how the people of Bristol feel about its eponymous stool chart, in Feedback’s weird weekly round-up

Animal sounds hold clues to biodiversity – help scientists unlock them

19 May 2021

From recording early morning birdsong in the Dawn Chorus app to identifying whales from their vocalisations, bioacoustics is becoming a key conservation tool. Here’s how to help scientists track biodiversity

This week’s new questions

19 May 2021

Why is a cup of teas so satisfying and comforting? And (aside from fluoride) is toothpaste essential for the health of our teeth?

How do animals recognise their young and do they know they reproduce?

19 May 2021

More answers from readers. Recognising your offspring doesn’t mean you won’t eat them, suggests one reader. And another illustrates how a dog is never too old to be admonished by its mother

What’s the minimum population needed to sustain a comfortable life?

19 May 2021

Readers give their take on the minimum population needed to support a comfortable life for someone in the US, in terms of the people who create and maintain infrastructure, goods and services

Why is it easier to copy a picture of an object than the real object?

19 May 2021

If I’m looking at a picture of an apple or the apple itself, wouldn’t the image on my retina be the same? So why is copying easier than drawing from real life? Readers respond