All today’s stories on newscientist.com, including: the origins of altruism, wild plants facing extinction and the countdown to oblivion

Did Leonardo decipher traces of ancient life centuries before Darwin?

Why are drug regulatory agencies discouraging the development of new antibiotics?

A colossal interplanetary collision doesn’t sound like a good thing – but without it, things might have turned out very differently

In The Shape of Inner Space, Shing-Tung Yau and Steve Nadis fight string theory’s corner by explaining multidimensional geometry

A new view of kin selection says it is part of a broader theory describing the evolution of behaviour in general

How did a collection of case reports lead to an untested drug being administered all over the world to people with serious bleeding, asks Ian Roberts

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Carbon dioxide may be bad for the climate, but it’s good for the roses. Perhaps it’s time we rehabilitated this gaseous villain

The UK Home Office has revoked the licence of the company who supplied an unauthorised Taser shotgun to British police