New Scientist
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In this week’s issue: How to understand your risk of Alzheimer’s - and what you can really do about it.

Grab a copy in shops now or download our app for digital editions.⁠
www.newscientist.com/issue/3564/
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Scientists have identified five sleep profiles, each of which is linked to distinct mental health symptoms and brain activity patterns
There are five types of sleep – here's what that means for your health
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Science fiction legend Ursula K. Le Guin is honoured with a new collection out this month, and sci-fi fans can also look forward to fiction from astronaut Chris Hadfield and award-winning authors Ken Liu and Mary Robinette Kowal
The best new science fiction books of October 2025
Science fiction legend Ursula K. Le Guin is honoured with a new collection out this month, and sci-fi fans can also look forward to fiction from astronaut Chris Hadfield and award-winning authors Ken Liu and Mary Robinette Kowal
www.newscientist.com
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Just because a food is ultra-processed doesn’t mean it is unhealthy. Regulation and eating advice must reflect this, say Julia Belluz and Kevin Hall, co-authors of Food Intelligence: The science of how food both nourishes and harms us
Why not all ultra-processed foods are bad for you
Just because a food is ultra-processed doesn’t mean it is unhealthy. Regulation and eating advice must reflect this, say Julia Belluz and Kevin Hall, co-authors of Food Intelligence: The science of how food both nourishes and harms us
www.newscientist.com
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In swamps and marshes, people occasionally see mysterious blue-tinged flashes of light above water, which have commonly been associated with ghosts or spirits. Now physicists may have finally worked out what causes them.
We may finally know what causes will-o’-the-wisps
Mysterious flashes of light seen in swamps and bogs could be caused by burning methane or other gases, ignited by sparks that fly between bubbles in water
www.newscientist.com