Science
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Billionaire entrepreneurs are trying to create rockets fit for human travel, while government agencies spend billions furthering their explorations. But we are still a long way off from making our way to the red planet
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Researchers investigate why excrement emerges in awkward-shaped blocks
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The conversation analyst on how to calm someone threatening suicide, how comedy works and Donald Trump’s take on reality -
Life expectancy is rising but Britons are being encouraged to retire early. That’s both ridiculous and costly, says an expert -
Historic vote means unit of measurement will no longer be defined by a piece of metal first conceived in 1889
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Millions worldwide may be unable to access the drug by 2030, scientists predict -
Analysis finds toxic air trims lifespans by 1.8 years, making it main threat to human health -
Key issues
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Consulting engineer known for his work on nuclear safety who was never afraid to take on such a powerful industry
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Genetic selection for intelligence has hit the market – and regulation has a critical role, says science writer Philip Ball
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Oxford Dictionaries’ words of the year are products of our heightened politics, says Guardian columnist Emma Brockes
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The solutions to today’s puzzles -
Shine your inner light bulb on these geometrical gems -
The solution to today’s puzzle -
A little known episode from the early seventeenth century
Multimedia
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Food is an essential part of everyones life but how does what we eat affect our health? -
Using high-resolution aerial photography from satellites and planes to mirror the phenomenon from which the project derives its name – the overview effect: the sensation experienced by astronauts when viewing Earth from space -
The Guardian has obtained an audio recording of a presentation by Craig Kelly at the right-aligned Mosman branch of the Liberal party in September that outlines in detail his climate scepticism
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Crows have been filmed solving a complex problem by assembling two separate rods to create a tool, behaviour that until now had only been observed in humans and great apes
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The US photographer Brad Goldpaint has beaten thousands of amateur and professional photographers from around the globe to win the Royal Observatory Greenwich’s title -
An international team of maritime archaeologists, scientists and marine surveyors has found more than 60 shipwrecks in the Black Sea. One of the findings has been confirmed to be the oldest intact shipwreck known to mankind.
Memory Philosophically speaking, we can never fully trust our memory