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Challenge your brain with our weekly puzzles, explore how readers respond to scientific questions, enjoy our pick of the best science, health and technology photography and laugh along with Feedback, our sideways look at the world of science.

Space

Get ready to spot comet Tsuchinshan-ATLAS next month

Comet C/2023 A3, also known as Tsuchinshan–ATLAS, is expected to grace our skies from mid-October. Abigail Beall is hoping for a dazzling display

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NEOWISE Comet in Night Sky with Milky Way Galaxy - Bright rare comet in dark sky with crisp bold Milky Way Galaxy and silhouetted trees mountain astrophotography landscape. Very dark skies perfect for stargazing.

BrainTwister #36: Prime generators

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3D illustration, brain shaped maze. Concept image of study and brain behavior.; Shutterstock ID 2177110871; purchase_order: -; job: -; client: -; other: -

Last Word

What is the largest size an animal can be?

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2RXK2EN Catford Local Area Photography
Tom Gauld on a new version of the Large Hadron Collider

Tom Gauld on a new version of the Large Hadron Collider

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Twisteddoodles on chemical ions

Twisteddoodles on chemical ions

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Could this be the way to get your children to eat their greens?

Could this be the way to get your children to eat their greens?

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A selection of elaborate birds' nests from around the world

Life

A selection of elaborate birds' nests from around the world

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Mandatory Credit: Photo by Joeff Davis/Shutterstock (14611938am) August 10, 2019 - Des Moines, Iowa: California Senator and democratic Presidential candidate Kamala Harris at the 'Cast Your Kernel' election during the Iowa State Fair. Senator Kamala Harris Tours Iowa State Fair, Des Moines - 10 Aug 2019

Mind

Is my frequent laughter damaging my credibility at work?

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Surrealism with a woman holding a mirror and covering her face in the field with a transparent background behind the mirror; Shutterstock ID 2153195107; purchase_order: -; job: -; client: -; other: -

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How do I know if what I see is actually there?

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This week’s new questions

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This week’s new questions

How do we know that gravity has the same speed as light? And why is this the case?Jonas Hermansson, Brösarp, Sweden

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3D illustration, brain shaped maze. Concept image of study and brain behavior.; Shutterstock ID 2177110871; purchase_order: -; job: -; client: -; other: -

BrainTwister #35: Cube cuts

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R1D8PY Silverback western lowland gorilla sitting down to eat at Zoo Atlanta in Atlanta, Georgia. (USA)

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Could aliens work out if a human or an ape built a tomb? Part 2

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Tom Gauld on what's fashionable in the laboratory

Tom Gauld on what's fashionable in the laboratory

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Twisteddoodles on how to increase your research's impact

Twisteddoodles on how to increase your research's impact

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