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 Features Sacred stones: unravelling StonehengeStonehenge is one of the world's best known monuments. But why it was built remains a riddle – one that the first archaeological dig in 40 years sought to solve.  Ice world: the catalyst for life?800 million years ago, a dramatic climatic lurch may have left our planet entombed in ice. But this snowball Earth could also have been the catalyst for complex life.  Nuclear power on the MoonWhen NASA astronauts set up the first manned outpost on the Moon, they may well pack a kilogram of uranium to take along with them.  The Hubble telescope: a time machine that revolutionised astronomyThe Hubble Space Telescope, the object of NASA's fifth and final servicing mission this week, has revolutionised our view and understanding of the universe.  A brief guide to cosmologyConfused by inflation and the CMB? Perplexed by dark energy and dark matter? Want to know what happened after the Big Bang? Then read on to learn how it all fits together.  Survival of the human speciesAlmost all of the species that have ever lived are now extinct. Could we be next?  Civilisations: why they failEven great and powerful civilisations have fallen because of choices they made to ignore their impact on the environment.  Children of MarsHow did astronomer Paul Davies come to propose that life arose on Mars and then seeded the Earth? Here he elucidates a theory that could offer us insights into the nature and origins of life.  Swine flu: the factsIt's spreading fast and experts think it could cause the biggest influenza pandemic since 1968. But what exactly is swine flu, where did it come from and why should we be worried?  Mass killer: how a flu pandemic might play outIt's the nightmare scenario health workers fear, but are nevertheless preparing for - the day when the next influenza pandemic arrives, and millions worldwide die.  Tireless female Nobel laureate turns 100She was oppressed by Mussolini’s regime, but later went on to make major discoveries. Italian senator and scientist, Rita Levi-Montalcini, is now the world's oldest living Nobel laureate.  Dark forcesIs the ultimate fate of our universe dependent on an utterly inexplicable form of dark energy?  Rage of reasonRichard Dawkins is a towering figure in evolution who skewers creationists for sport. He doesn't suffer fools gladly, but was kind enough to talk to Robin McKie.  Do you have to be nuts to be a genius?To see, hear and imagine what others cannot. But at a cost: mood swings and difficulty comprehending social norms and expressing emotions. Is this what it takes to be a genius?  Grisly sights await visitors to museum of human diseaseSydney's Museum of Human Disease has opened its doors to the public, allowing visitors to view a Pandora's box of plague, pestilence and disease in graphic detail. 
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