Editor's note

We put a lot of trust in our memories, often believing that the things we remember are exactly as they happened, no matter how much time has passed. But as Robert Nash explains, our memory is not as reliable as we think it is – even something as simple as recalling a past memory can change how we’ll remember it in the future.

If you’re sitting down, you might want to stand up while you read this, as researchers have found sitting for too long could increase your risk of dying – even if you exercise. Matthew Haines gives his top tips for getting more movement into your life and explains why sitting on the floor could be part of the solution. And in other health research, there’s new evidence Chronic Fatigue Syndrome could have a biological cause. Alice Russell and Carmine Pariante explain how an overactive immune system could trigger this long-term condition.

Keeping global warming to 1.5°C will demand that we “geoengineer” the climate in some way, according to a recent IPCC report. But what does this mean, and what interventions are out there? In the latest in our expert debate series, Head to Head, natural scientist Matthew Watson and social scientist Rob Bellamy debate the pros and cons of various methods devised to block out the sun. They take a close look at the controversies involved, and discuss how research in this contentious area should be governed.

All the best.

Heather Kroeker

Assistant Section Editor

Tiny mistakes can appear in our memories every time we recall past events. Quick Shot/ Shutterstock

Are memories reliable? Expert explains how they change more than we realise

Robert Nash, Aston University

Even our most treasured memories can gradually change over time.

Netflix and chill? Too many of us spend the majority of our time sitting. Shutterstock

Sitting for too long could increase your risk of dying – even if you exercise

Matthew Haines, University of Huddersfield

Sitting too much might be killing you – this is what you can do about it.

Ekaterina Karpacheva/Shutterstock.com

Should we engineer the climate? A social scientist and natural scientist discuss

Rob Bellamy, University of Manchester; Matthew Watson, University of Bristol

Nations may soon be desperate enough about global warming to consider deliberately engineering the world’s climate.

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