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 Cosmos Online Biofuels: still our best betWhen the kerfuffle about biofuels a couple of years ago finally died down, everyone was left a little confused. But it is still our best option, argues David Harries.  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?  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.  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.  Is there anybody out there? Searching for aliens through historyThe desire to contact intelligent life on other planets is much older than the UFO craze and the SETI movement. In fact, it goes back to the Ancient Greeks…  Rebuilding science in IraqIraq is rebuilding its science base, but fear of attack means refugee academics are slow to return.  I'd love to have a beer with a VulcanSlim Dusty was one of the biggest Australian country music singers of all time, who sold more than seven millions albums and singles, but few people realise he was Trekkie, and recorded a song about Star Trek.  Genetic testing: Do you really want to know?An individual's genetic code is becoming an open book thanks to kits that scan for genes linked to traits and diseases, from cancer and baldness to infertility and memory loss.  Marine reserves proliferate worldwideMassive ocean reserves, larger than Spain and created as one of the last acts of the outgoing U.S. President, are among a multitude of marine parks cropping up across the planet.  Big friendly giant: the Giant Magellan TelescopeSize definitely matters when it comes to telescopes, and a new seven-mirrored monster looks like being the biggest and best of them all.  Real vs fake Christmas trees: which are better for the environment?A living pine tree fills your house with an earthy aroma; fake trees are cheap and easy to store, but when it comes to the environment, which should we choose?  Seven wacky ways to battle global warmingSome of the stranger schemes proposed to tackle global warming were knocked down by the U.N.'s IPCC last year - but they may soon be back in favour. 
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