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4 articles from Guardian Unlimited Science

I have four dogs, seven cats and three horses – and I’ve never been more content

Being able to understand and manage emotions is key to health and happiness. For some, like me, that comes easier with animalsI like people. I really do. In fact, some of my best friends are people. However, most of my best friends are animals and if I had to choose between spending time with people or spending time with animals, I’d choose animals. I simply find them easier, and quite often...

Readers reply: what is the evolutionary purpose of toenails?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical conceptsCan you help: What is the most dangerous food in the world?What, if any, are the evolutionary purpose of toenails?Gerard MarksSend new questions to nq@theguardian.com. Continue...

Do wood burners add to air pollution in cities? Yes, say citizen scientists

Pioneering Bristol study blames the solid-fuel burners in people’s homes for breaches of World Health Organisation guidelinesLike many parts of the country, Bristol has experienced a huge rise in the number of houses installing wood burners over the past decade. But as they have proliferated, mainly in the wealthier parts of the city where many Victorian and Georgian houses have been renovated,...

Can cross-breeding protect endangered species from the climate emergency?

Creating hybrids might make animals more resistant to global heating, but it may mean losing species altogetherThe Houston Ship Channel is a rubbish home for a fish. It’s one of the busiest ports in the world and all that traffic has made the water slick with toxic chemicals. Yet the Gulf killifish has found a way: it has evolved pollution resistance by cross-breeding with a different species,...