This week’s new questions
Cats like fish but hate water. How did they catch fish before they were domesticated? And why can we get flu straight after being vaccinated?
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Health
How a Ugandan vet saved hundreds of gorillas by treating human disease
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Environment
Meet Mr Trash Wheel — the social media star tackling plastic pollution
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Space
See the northern lights or aurora borealis: Follow this easy guide
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Greta Thunberg’s gold mining doppelgänger found in 1898 photo
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Shrinking gravity: why doesn’t gravity diminish over time?
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Super seers: why some people can see ultraviolet light
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This week’s new question
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Life
Heroism and slapstick humour: Wolf behaviour can be amazingly human
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Environment
Bali’s stunning rice terraces offer clues to sustainable water use
This serene image of Bali's traditional rice terraces shows what indigenous tech can offer the world – despite severe water shortages threatening the island
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Space
Seize your chance to spot Mercury, the solar system’s smallest planet
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Need a digital detox? Then why not make a paper copy of your phone
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Can you make a screen adjust for those who are short-sighted?
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Strangers in dreams: are they real people or inventions?
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