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 Features The end of evolution?Humans are undergoing a 'grand averaging', argues British geneticist Steve Jones, because the raw material for evolution has largely disappeared.  Deep calm: why is the Sun so quiet?The sunspot cycle is behaving a little like the stock market. Just when you think it has hit bottom, it goes even lower.  Drowned reef: world's largest fossilWhat may be the world's largest fossil has been found off the coast of Australia. A reef perhaps as long as the Great Barrier Reef itself, it was drowned long ago by rising seas.  Nature to the rescueMore and more technology is mimicking the natural world to find global solutions to environmental problems.  Brief guide to stem cellsThe controversial quest to harness the power of embryonic stem cells may be about to enter a new phase in the United States. But what exactly are stem cells?  Taming the wildArchaeologists are rounding up some remarkable clues as to when our ancestors first tamed wild horses.  Domestication: a timelineWe built our modern civilisation on the backs of a supporting cast of plants, animals and microbes.  Forensic seismologyFrom the fall of the World Trade Centre on 9-11 to sunken subs and smuggling in South America, sensitive seismometers are proving useful to monitor much more than earthquakes.  From guts to glory: turning waste into oilIt sounds miraculous - a machine to convert waste into oil. But the road to profitability has been paved with many problems... and turkey carcasses.  Darwin at 200: The origin of a theoryWas Charles Darwin the genius behind the greatest revolution in science, or did he merely state the obvious?  Darwin at 200: Saluting the founder of evolutionary theoryTwo hundred years ago, in a wealthy household in rural England, a child was born who, in a quiet, dogged and peaceful way, was destined to become one of history's greatest revolutionaries.  Darwin at 200: Modest father of biologyCharles Darwin's ideas on evolution changed the face of science forever, but he was a modest, shy man who preferred to stay at home with his work and family than revel in celebrity.  Darwin at 200: Darwin's natural laboratoryThe Galapagos Islands were to Charles Darwin what the legendary falling apple was to Isaac Newton.  Darwin at 200: a timelineDarwin bequeathed a theoretical legacy that remains a pillar of modern science – read our brief history of his life and the evolution of his theory.  Oceans of acidAs global warming wreaks havoc on coral reefs, evidence is mounting that another problem caused by carbon dioxide is an even bigger threat. But is it too late to fix? 
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